Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=e03ba84adb62fbc6049325a5bc00ef6932fa5e39
Commit: e03ba84adb62fbc6049325a5bc00ef6932fa5e39
Parent: 67b4af297033f5f65999885542f95ba7b562848a
Author: Pablo Neira Ayuso <[EMAIL PROTECTED]>
AuthorDate: Sat Dec 1 00:03:52 2007 +1100
Committer: Herbert Xu <[EMAIL PROTECTED]>
CommitDate: Sat Dec 1 00:03:52 2007 +1100
[TEXTSEARCH]: Do not allow zero length patterns in the textsearch
infrastructure
If a zero length pattern is passed then return EINVAL.
Avoids infinite loops (bm) or invalid memory accesses (kmp).
Signed-off-by: Pablo Neira Ayuso <[EMAIL PROTECTED]>
Signed-off-by: Patrick McHardy <[EMAIL PROTECTED]>
Signed-off-by: Herbert Xu <[EMAIL PROTECTED]>
---
lib/textsearch.c | 8 ++++++--
1 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/lib/textsearch.c b/lib/textsearch.c
index 88c98a2..be8bda3 100644
--- a/lib/textsearch.c
+++ b/lib/textsearch.c
@@ -7,7 +7,7 @@
* 2 of the License, or (at your option) any later version.
*
* Authors: Thomas Graf <[EMAIL PROTECTED]>
- * Pablo Neira Ayuso <[EMAIL PROTECTED]>
+ * Pablo Neira Ayuso <[EMAIL PROTECTED]>
*
* ==========================================================================
*
@@ -250,7 +250,8 @@ unsigned int textsearch_find_continuous(struct ts_config
*conf,
* the various search algorithms.
*
* Returns a new textsearch configuration according to the specified
- * parameters or a ERR_PTR().
+ * parameters or a ERR_PTR(). If a zero length pattern is passed, this
+ * function returns EINVAL.
*/
struct ts_config *textsearch_prepare(const char *algo, const void *pattern,
unsigned int len, gfp_t gfp_mask, int
flags)
@@ -259,6 +260,9 @@ struct ts_config *textsearch_prepare(const char *algo,
const void *pattern,
struct ts_config *conf;
struct ts_ops *ops;
+ if (len == 0)
+ return ERR_PTR(-EINVAL);
+
ops = lookup_ts_algo(algo);
#ifdef CONFIG_KMOD
/*
-
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