This is a note to let you know that I've just added the patch titled
btrfs: handle memory allocation failure in btrfs_csum_one_bio
to the 6.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
btrfs-handle-memory-allocation-failure-in-btrfs_csum.patch
and it can be found in the queue-6.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5e561b2044a7a50df7c05016ce7f3b22162a00f3
Author: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
Date: Thu May 4 13:58:13 2023 +0200
btrfs: handle memory allocation failure in btrfs_csum_one_bio
[ Upstream commit 806570c0bb7b4847828c22c4934fcf2dc8fc572f ]
Since f8a53bb58ec7 ("btrfs: handle checksum generation in the storage
layer") the failures of btrfs_csum_one_bio() are handled via
bio_end_io().
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>
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);
memalloc_nofs_restore(nofs_flag);
- BUG_ON(!sums); /* -ENOMEM */
+ if (!sums)
+ return BLK_STS_RESOURCE;
+
sums->len = bytes_left;
ordered = btrfs_lookup_ordered_extent(inode,
offset);
