From: Johannes Thumshirn johannes.thumshirn@wdc.com
[ 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@syzkaller.appspotmail.com Reviewed-by: Christoph Hellwig hch@lst.de Reviewed-by: Anand Jain anand.jain@oracle.com Signed-off-by: Johannes Thumshirn johannes.thumshirn@wdc.com Reviewed-by: David Sterba dsterba@suse.com Signed-off-by: David Sterba dsterba@suse.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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 dd8b02a2a14a0..4c210b2ac6994 100644 --- a/fs/btrfs/file-item.c +++ b/fs/btrfs/file-item.c @@ -700,7 +700,9 @@ blk_status_t btrfs_csum_one_bio(struct btrfs_inode *inode, struct bio *bio, 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);