From 661bec6ba884b86517ef5ea529aabb281a7198d9 Mon Sep 17 00:00:00 2001 From: Gabriel de Perthuis Date: Wed, 10 Oct 2012 08:50:47 -0600 Subject: 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. --- fs/btrfs/backref.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs') 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; -- cgit v1.2.3