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authorGabriel de Perthuis <g2p.code@gmail.com>2012-10-10 08:50:47 -0600
committerChris Mason <chris.mason@fusionio.com>2012-10-25 15:39:47 -0400
commit661bec6ba884b86517ef5ea529aabb281a7198d9 (patch)
tree22881cdc9bf3d67c78ee07b24195885b0f0f223f /fs/btrfs
parentf46dbe3dee853f8a860f889cb2b7ff4c624f2a7a (diff)
downloadlinux-661bec6ba884b86517ef5ea529aabb281a7198d9.tar.bz2
Fix a sign bug causing invalid memory access in the ino_paths ioctl.
To see the problem, create many hardlinks to the same file (120 should do it), then look up paths by inode with: ls -i btrfs inspect inode-resolve -v $ino /mnt/btrfs I noticed the memory layout of the fspath->val data had some irregularities (some unnecessary gaps that stop appearing about halfway), so I'm not sure there aren't any bugs left in it.
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/backref.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index f3187938e081..2bcbea3f6308 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -1186,7 +1186,7 @@ static char *ref_to_path(struct btrfs_root *fs_root,
int slot;
u64 next_inum;
int ret;
- s64 bytes_left = size - 1;
+ s64 bytes_left = ((s64)size) - 1;
struct extent_buffer *eb = eb_in;
struct btrfs_key found_key;
int leave_spinning = path->leave_spinning;