[Bug 513582] segfault in FTC_CMapCache_Lookup()

2009-09-29 Thread bugzilla
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https://bugzilla.redhat.com/show_bug.cgi?id=513582





--- Comment #41 from mpsuz...@hiroshima-u.ac.jp  2009-09-29 13:48:21 EDT ---
The patch in comment #35 is applied to git head. freetype-2.3.10 will include
it.
Thanks to everybody helped me.

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[Bug 513582] segfault in FTC_CMapCache_Lookup()

2009-09-28 Thread bugzilla
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https://bugzilla.redhat.com/show_bug.cgi?id=513582





--- Comment #39 from Adam Williamson awill...@redhat.com  2009-09-28 13:37:17 
EDT ---
yup, seems OK, navit runs without errors, nothing else seems to have any
problems.

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[Bug 513582] segfault in FTC_CMapCache_Lookup()

2009-09-28 Thread bugzilla
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https://bugzilla.redhat.com/show_bug.cgi?id=513582





--- Comment #40 from mpsuz...@hiroshima-u.ac.jp  2009-09-28 13:50:27 EDT ---
Thank you!
I will add the patch proposed in comment #35 to next release of freetype,
2.3.0.

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[Bug 513582] segfault in FTC_CMapCache_Lookup()

2009-09-26 Thread bugzilla
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https://bugzilla.redhat.com/show_bug.cgi?id=513582





--- Comment #29 from Kevin Kofler ke...@tigcc.ticalc.org  2009-09-26 02:23:48 
EDT ---
Behdad is right, mpsuzuki's fix is NOT correct, please DO NOT use this! Every
fix using that pnode hack will always be an aliasing rule violation. Even if
it happens to work with the current GCC, it may break at any point in the
future. Please read comment #19 if you really want to be able to compile this C
code with C++ (which I don't give a darn about, and which shouldn't take
priority over making it actually VALID C – that aliasing violation is not valid
C++ either, by the way; you'd use inheritance to do this properly in C++, if
this were actually C++ code, which it isn't).

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[Bug 513582] segfault in FTC_CMapCache_Lookup()

2009-09-26 Thread bugzilla
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https://bugzilla.redhat.com/show_bug.cgi?id=513582





--- Comment #35 from mpsuz...@hiroshima-u.ac.jp  2009-09-26 12:36:37 EDT ---
Created an attachment (id=362766)
 -- (https://bugzilla.redhat.com/attachment.cgi?id=362766)
Patch to cast the pointers allocated by FTC_XXX_LOOKUP_CMP() in the callers.

Kevin,

This is what you suggested in comment #19?

diff --git a/src/cache/ftccmap.c b/src/cache/ftccmap.c
index 50a6189..428cebb 100644
--- a/src/cache/ftccmap.c
+++ b/src/cache/ftccmap.c
@@ -283,7 +283,7 @@
   {
 FTC_Cache cache = FTC_CACHE( cmap_cache );
 FTC_CMapQueryRec  query;
-FTC_CMapNode  node;
+FTC_Node  node;
 FT_Error  error;
 FT_UInt   gindex = 0;
 FT_UInt32 hash;
@@ -373,18 +373,18 @@
 FTC_CACHE_LOOKUP_CMP( cache, ftc_cmap_node_compare, hash, query,
   node, error );
 #else
-error = FTC_Cache_Lookup( cache, hash, query, (FTC_Node*) node );
+error = FTC_Cache_Lookup( cache, hash, query, node );
 #endif
 if ( error )
   goto Exit;

-FT_ASSERT( (FT_UInt)( char_code - node-first )  FTC_CMAP_INDICES_MAX );
+FT_ASSERT( (FT_UInt)( char_code - FTC_CMAP_NODE( node )-first ) 
FTC_CMAP_INDICES_MAX );

 /* something rotten can happen with rogue clients */
-if ( (FT_UInt)( char_code - node-first = FTC_CMAP_INDICES_MAX ) )
+if ( (FT_UInt)( char_code - FTC_CMAP_NODE( node )-first =
FTC_CMAP_INDICES_MAX ) )
   return 0;

-gindex = node-indices[char_code - node-first];
+gindex = FTC_CMAP_NODE( node )-indices[char_code - FTC_CMAP_NODE( node
)-first];
 if ( gindex == FTC_CMAP_UNKNOWN )
 {
   FT_Face  face;
@@ -392,7 +392,7 @@

   gindex = 0;

-  error = FTC_Manager_LookupFace( cache-manager, node-face_id, face );
+  error = FTC_Manager_LookupFace( cache-manager, FTC_CMAP_NODE( node
)-face_id, face );
   if ( error )
 goto Exit;

@@ -413,7 +413,7 @@
   FT_Set_Charmap( face, old );
   }

-  node-indices[char_code - node-first] = (FT_UShort)gindex;
+  FTC_CMAP_NODE( node )-indices[char_code - FTC_CMAP_NODE( node )-first]
= (FT_UShort)gindex;
 }

   Exit:

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[Bug 513582] segfault in FTC_CMapCache_Lookup()

2009-09-26 Thread bugzilla
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https://bugzilla.redhat.com/show_bug.cgi?id=513582





--- Comment #30 from mpsuz...@hiroshima-u.ac.jp  2009-09-26 02:44:39 EDT ---
Thanks Behdad  Kevin,
My fix in #25 just disables the problematic optimization in GCC-4.4.x,
I know it does not fix the strict aliasing issue (I thought it was different
issue). I will try another fix following to comment #19.

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[Bug 513582] segfault in FTC_CMapCache_Lookup()

2009-09-26 Thread bugzilla
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https://bugzilla.redhat.com/show_bug.cgi?id=513582





--- Comment #36 from mpsuz...@hiroshima-u.ac.jp  2009-09-26 12:44:22 EDT ---
Created an attachment (id=362768)
 -- (https://bugzilla.redhat.com/attachment.cgi?id=362768)
source rpm including the 3rd patch proposed by mpsuzuki

The source rpm including patch in comment #35.

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[Bug 513582] segfault in FTC_CMapCache_Lookup()

2009-09-26 Thread bugzilla
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https://bugzilla.redhat.com/show_bug.cgi?id=513582





--- Comment #31 from mpsuz...@hiroshima-u.ac.jp  2009-09-26 08:02:58 EDT ---
Created an attachment (id=362757)
 -- (https://bugzilla.redhat.com/attachment.cgi?id=362757)
Patch to introduce the unions to the parts violating strict aliasing.

Behdad,

Following is what you suggested?
Attached is a patch to do similar modifications for all part
warned as violating strict aliasing.

diff --git a/src/cache/ftccmap.c b/src/cache/ftccmap.c
index 50a6189..8fb3387 100644
--- a/src/cache/ftccmap.c
+++ b/src/cache/ftccmap.c
@@ -283,11 +283,15 @@
   {
 FTC_Cache cache = FTC_CACHE( cmap_cache );
 FTC_CMapQueryRec  query;
-FTC_CMapNode  node;
 FT_Error  error;
 FT_UInt   gindex = 0;
 FT_UInt32 hash;
 FT_Intno_cmap_change = 0;
+union
+{
+  FTC_Node  node;
+  FTC_CMapNode  cmap;
+} ftc_unode;


 if ( cmap_index  0 )
@@ -371,20 +375,20 @@

 #if 1
 FTC_CACHE_LOOKUP_CMP( cache, ftc_cmap_node_compare, hash, query,
-  node, error );
+  ftc_unode.node, error );
 #else
-error = FTC_Cache_Lookup( cache, hash, query, (FTC_Node*) node );
+error = FTC_Cache_Lookup( cache, hash, query, (ftc_unode.node) );
 #endif
 if ( error )
   goto Exit;

-FT_ASSERT( (FT_UInt)( char_code - node-first )  FTC_CMAP_INDICES_MAX );
+FT_ASSERT( (FT_UInt)( char_code - ftc_unode.cmap-first ) 
FTC_CMAP_INDICES_MAX );

 /* something rotten can happen with rogue clients */
-if ( (FT_UInt)( char_code - node-first = FTC_CMAP_INDICES_MAX ) )
+if ( (FT_UInt)( char_code - ftc_unode.cmap-first = FTC_CMAP_INDICES_MAX
) )
   return 0;

-gindex = node-indices[char_code - node-first];
+gindex = ftc_unode.cmap-indices[char_code - ftc_unode.cmap-first];
 if ( gindex == FTC_CMAP_UNKNOWN )
 {
   FT_Face  face;
@@ -392,7 +396,7 @@

   gindex = 0;

-  error = FTC_Manager_LookupFace( cache-manager, node-face_id, face );
+  error = FTC_Manager_LookupFace( cache-manager, ftc_unode.cmap-face_id,
face );
   if ( error )
 goto Exit;

@@ -413,7 +417,7 @@
   FT_Set_Charmap( face, old );
   }

-  node-indices[char_code - node-first] = (FT_UShort)gindex;
+  ftc_unode.cmap-indices[char_code - ftc_unode.cmap-first] =
(FT_UShort)gindex;
 }

   Exit:

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[Bug 513582] segfault in FTC_CMapCache_Lookup()

2009-09-26 Thread bugzilla
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https://bugzilla.redhat.com/show_bug.cgi?id=513582





--- Comment #33 from Kevin Kofler ke...@tigcc.ticalc.org  2009-09-26 08:10:24 
EDT ---
This one should now work with GCC and other real-world compilers. It's still
not valid C because the C standard explicitly does not require a union to be
100% overlapping storage (if you assign one member, the value of the other is
undefined), in fact handling union as struct would still be a compliant
implementation of union. But GCC *does* guarantee that you can use union
that way and other compilers in practical use do as well.

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[Bug 513582] segfault in FTC_CMapCache_Lookup()

2009-09-26 Thread bugzilla
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comments should be made in the comments box of this bug.


https://bugzilla.redhat.com/show_bug.cgi?id=513582





--- Comment #32 from mpsuz...@hiroshima-u.ac.jp  2009-09-26 08:05:08 EDT ---
Created an attachment (id=362758)
 -- (https://bugzilla.redhat.com/attachment.cgi?id=362758)
source rpm including the 2nd patch proposed by mpsuzuki

Here is new source rpm including my 2nd patch.

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[Bug 513582] segfault in FTC_CMapCache_Lookup()

2009-09-26 Thread bugzilla
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https://bugzilla.redhat.com/show_bug.cgi?id=513582





--- Comment #37 from Kevin Kofler ke...@tigcc.ticalc.org  2009-09-26 14:35:17 
EDT ---
Yeah, that was my idea and I think that's the safest solution.

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[Bug 513582] segfault in FTC_CMapCache_Lookup()

2009-09-26 Thread bugzilla
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https://bugzilla.redhat.com/show_bug.cgi?id=513582





--- Comment #34 from mpsuz...@hiroshima-u.ac.jp  2009-09-26 08:24:05 EDT ---
Thank you very quick reply.
Hmm, I should rework. You suggested to pass FTC_Node variable
to FTC_CACHE_LOOKUP_CMP() and cast it to FTC_CMapNode
by caller. It is safer than using union?

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[Bug 513582] segfault in FTC_CMapCache_Lookup()

2009-09-25 Thread bugzilla
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https://bugzilla.redhat.com/show_bug.cgi?id=513582





--- Comment #25 from mpsuz...@hiroshima-u.ac.jp  2009-09-25 02:07:54 EDT ---
Created an attachment (id=362615)
 -- (https://bugzilla.redhat.com/attachment.cgi?id=362615)
source rpm including the patch proposed by mpsuzuki

Here is the source rpm including the patch proposed in
https://bugzilla.redhat.com/show_bug.cgi?id=513582#c23

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[Bug 513582] segfault in FTC_CMapCache_Lookup()

2009-09-25 Thread bugzilla
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https://bugzilla.redhat.com/show_bug.cgi?id=513582





--- Comment #27 from mpsuz...@hiroshima-u.ac.jp  2009-09-25 14:34:00 EDT ---
Thank you very much for testing!
I will replace previous fix for ftccache.h by new one.

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[Bug 513582] segfault in FTC_CMapCache_Lookup()

2009-09-25 Thread bugzilla
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https://bugzilla.redhat.com/show_bug.cgi?id=513582





--- Comment #28 from Behdad Esfahbod besfa...@redhat.com  2009-09-25 22:21:01 
EDT ---
As far as I understand, the proposed fix still violates C aliasing rules, even
if gcc currently is not smart enough for it.  One fix I can imagine is to
introduce a union that has both pointer types as members, the assing to one,
read from the other.

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[Bug 513582] segfault in FTC_CMapCache_Lookup()

2009-09-24 Thread bugzilla
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https://bugzilla.redhat.com/show_bug.cgi?id=513582


mpsuz...@hiroshima-u.ac.jp changed:

   What|Removed |Added

 CC||mpsuz...@hiroshima-u.ac.jp




--- Comment #23 from mpsuz...@hiroshima-u.ac.jp  2009-09-25 01:39:16 EDT ---
As Kevin mentioned already, proposed fix has a side effect
that GCC finds a cast between incompatible pointers.
Although current git head of FreeType2 includes it,
I want to revert it.

In my investigation, the crashing behaviour was supposed to
be introduced by  Richard Guenther's inline optimizer for
GCC-4.4 branch, committed on 2008-08-09.
For detail, see https://savannah.nongnu.org/bugs/index.php?27441

I propose another fix to pass the problem, aslike:

diff --git a/src/cache/ftccache.h b/src/cache/ftccache.h
index 2082bc4..5e932b7 100644
--- a/src/cache/ftccache.h
+++ b/src/cache/ftccache.h
@@ -206,7 +206,7 @@ FT_BEGIN_HEADER
  \
  \
 error = 0;   \
-node  = NULL;\
+/* node  = NULL; */  \
 _idx  = _hash  _cache-mask;\
 if ( _idx  _cache-p )  \
   _idx = _hash  ( _cache-mask*2 + 1 ); \
@@ -246,7 +246,8 @@ FT_BEGIN_HEADER
 error = FTC_Cache_NewNode( _cache, _hash, query, _node );   \
  \
   _Ok:   \
-node = _node;\
+_pnode = (FTC_Node*)(void*)(node);  \
+*_pnode = _node; \
   FT_END_STMNT

 #else /* !FTC_INLINE */

I want to revert the fix that current FC11 uses and apply
this patch. Anybody can test if this fix works well?

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[Bug 513582] segfault in FTC_CMapCache_Lookup()

2009-09-24 Thread bugzilla
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https://bugzilla.redhat.com/show_bug.cgi?id=513582





--- Comment #24 from Adam Williamson awill...@redhat.com  2009-09-25 01:43:41 
EDT ---
if you throw out a scratch build, I will check it.

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[Bug 513582] segfault in FTC_CMapCache_Lookup()

2009-07-30 Thread bugzilla
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https://bugzilla.redhat.com/show_bug.cgi?id=513582





--- Comment #20 from Adam Williamson awill...@redhat.com  2009-07-30 12:38:54 
EDT ---
Would it be too much to ask if this could be patched in Rawhide while we wait
for a new upstream release? It would help me get my navit package review done,
because that app fails to run entirely unless this bug is fixed, so my review
for it will be stuck in limbo until this bug is fixed. thanks!

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[Bug 513582] segfault in FTC_CMapCache_Lookup()

2009-07-30 Thread bugzilla
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--- Comment #21 from Behdad Esfahbod besfa...@redhat.com  2009-07-30 14:05:21 
EDT ---
Building.

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[Bug 513582] segfault in FTC_CMapCache_Lookup()

2009-07-30 Thread bugzilla
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--- Comment #22 from Adam Williamson awill...@redhat.com  2009-07-30 18:43:47 
EDT ---
Thanks a bunch, Behdad - I really appreciate it.

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[Bug 513582] segfault in FTC_CMapCache_Lookup()

2009-07-25 Thread bugzilla
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https://bugzilla.redhat.com/show_bug.cgi?id=513582





--- Comment #6 from Fedora Update System upda...@fedoraproject.org  
2009-07-25 16:24:14 EDT ---
freetype-2.3.9-5.fc11 has been submitted as an update for Fedora 11.
http://admin.fedoraproject.org/updates/freetype-2.3.9-5.fc11

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[Bug 513582] segfault in FTC_CMapCache_Lookup()

2009-07-25 Thread bugzilla
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--- Comment #7 from Kevin Kofler ke...@tigcc.ticalc.org  2009-07-25 17:59:05 
EDT ---
What about F12? And F10?

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[Bug 513582] segfault in FTC_CMapCache_Lookup()

2009-07-25 Thread bugzilla
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https://bugzilla.redhat.com/show_bug.cgi?id=513582





--- Comment #8 from Behdad Esfahbod besfa...@redhat.com  2009-07-25 23:31:02 
EDT ---
I reported the issue upstream, so I'm hoping to get a new release with the fix
for F12.  Feel free to build for F10.

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[Bug 513582] segfault in FTC_CMapCache_Lookup()

2009-07-24 Thread bugzilla
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https://bugzilla.redhat.com/show_bug.cgi?id=513582


Kevin Kofler ke...@tigcc.ticalc.org changed:

   What|Removed |Added

   Flag||needinfo?(besfa...@redhat.c
   ||om)




--- Comment #4 from Kevin Kofler ke...@tigcc.ticalc.org  2009-07-24 09:29:08 
EDT ---
Yeah, a classic aliasing violation.

Behdad: ping?

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