btrfs: scrub: put bio after errors in scrub_raid56_parity_stripe()

commit 5fea61a upstream.

scrub_raid56_parity_stripe() allocates a bio with bio_alloc(), but
fails to release it on some error paths, leading to a potential
memory leak.

Add the missing bio_put() calls to properly drop the bio reference
in those error cases.

Fixes: 1009254 ("btrfs: scrub: use scrub_stripe to implement RAID56 P/Q scrub")
CC: [email protected] # 6.6+
Reviewed-by: Qu Wenruo <[email protected]>
Signed-off-by: Zilin Guan <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: GoodLuck612

fs/btrfs/scrub.c

@@ -2091,6 +2091,7 @@ static int scrub_raid56_parity_stripe(struct scrub_ctx *sctx,
 	ret = btrfs_map_block(fs_info, BTRFS_MAP_WRITE, full_stripe_start,
 			      &length, &bioc, NULL, NULL);
 	if (ret < 0) {
+		bio_put(bio);
 		btrfs_put_bioc(bioc);
 		btrfs_bio_counter_dec(fs_info);
 		goto out;
@@ -2100,6 +2101,7 @@ static int scrub_raid56_parity_stripe(struct scrub_ctx *sctx,
 	btrfs_put_bioc(bioc);
 	if (!rbio) {
 		ret = -ENOMEM;
+		bio_put(bio);
 		btrfs_bio_counter_dec(fs_info);
 		goto out;
 	}