on 01/20/2009 02:16 AM, Zach Carter wrote:
> We should probably just get an informative error message here, not a segfault.
>
> Also, I got the same segfault when running "btrfsck -h" (it was looking for a
> file named "-h". I'd be happy to contribute a getopts patch, if that is
> desired.
>
> -Zach
>
> [zcar...@nudj btrfs-progs-unstable]$ touch foo
> [zcar...@nudj btrfs-progs-unstable]$ ./btrfsck ./foo
> No valid Btrfs found on ./foo
> Segmentation fault
> [zcar...@nudj btrfs-progs-unstable]$ gdb ./btrfsck
> GNU gdb Fedora (6.8-29.fc10)
> Copyright (C) 2008 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law. Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "x86_64-redhat-linux-gnu"...
> (gdb) run ./foo
> Starting program: /opt/src/btrfs-progs-unstable/btrfsck ./foo
> No valid Btrfs found on ./foo
>
> Program received signal SIGSEGV, Segmentation fault.
> check_extents (root=0x0) at btrfsck.c:2006
> 2006 add_root_to_pending(root->fs_info->tree_root->node, bits,
> bits_nr,
> (gdb)
I think the following patch can fix this problem.
Signed-off-by: Shen Feng <s...@cn.fujitsu.com>
---
btrfsck.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/btrfsck.c b/btrfsck.c
index 4a41e6d..c95fe83 100644
--- a/btrfsck.c
+++ b/btrfsck.c
@@ -2074,6 +2074,8 @@ int main(int ac, char **av)
radix_tree_init();
root = open_ctree(av[1], 0, 0);
+ if (!root)
+ return 1;
ret = check_extents(root);
if (ret)
-- 1.6.0.6
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