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Btrfs-progs: sanity check the number of items in a leaf V2 

I hit this while working on fsck, I got some weird corruption where the number
of items was way higher than what would fit in a leaf, which would make things
blow up.  This fixes the problem by catching it and returning an error so we
gracefully exit instead of segfaulting.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
master
Josef Bacik 2013-05-09 13:56:19 +00:00 committed by Chris Mason
parent 0ba706acd8
commit 850581d48a
1 changed files with 6 additions and 0 deletions
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6
ctree.c
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@ -638,6 +638,12 @@ int btrfs_check_leaf(struct btrfs_root *root,
struct btrfs_disk_key key;
u32 nritems = btrfs_header_nritems(buf);
if (nritems * sizeof(struct btrfs_item) > buf->len) {
fprintf(stderr, "invalid number of items %llu\n",
(unsigned long long)buf->start);
goto fail;
}
if (btrfs_header_level(buf) != 0) {
fprintf(stderr, "leaf is not a leaf %llu\n",
(unsigned long long)btrfs_header_bytenr(buf));