[PATCH AUTOSEL 6.3 18/37] btrfs: handle memory allocation failure in btrfs_csum_one_bio

From: Sasha Levin
Date: Wed May 31 2023 - 09:42:17 EST

From: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>

[ Upstream commit 806570c0bb7b4847828c22c4934fcf2dc8fc572f ]

Since f8a53bb58ec7 ("btrfs: handle checksum generation in the storage
layer") the failures of btrfs_csum_one_bio() are handled via

This means, we can return BLK_STS_RESOURCE from btrfs_csum_one_bio() in
case the allocation of the ordered sums fails.

This also fixes a syzkaller report, where injecting a failure into the
kvzalloc() call results in a BUG_ON().

Reported-by: syzbot+d8941552e21eac774778@xxxxxxxxxxxxxxxxxxxxxxxxx
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Anand Jain <anand.jain@xxxxxxxxxx>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
fs/btrfs/file-item.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index a4584c629ba35..9e45b416a9c85 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -847,7 +847,9 @@ blk_status_t btrfs_csum_one_bio(struct btrfs_bio *bbio)
sums = kvzalloc(btrfs_ordered_sum_size(fs_info,
bytes_left), GFP_KERNEL);
- BUG_ON(!sums); /* -ENOMEM */
+ if (!sums)
sums->len = bytes_left;
ordered = btrfs_lookup_ordered_extent(inode,