[PATCH 3/3] block: handle nogenerate/noverify properly in fs-integrity

Check the BIP_CHECK flags before generating or verifying PI information,
otherwise this can be incorrectly called for non-PI metadata and
cause generation of incorrect metadata and crashed in the verification
handler.

The new behavior matches that of the block layer auto-generated
metadata.

Fixes: 0bde8a12b554 ("block: add fs_bio_integrity helpers")
Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Kanchan Joshi <[email protected]>
---
 block/bio-integrity-fs.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/block/bio-integrity-fs.c b/block/bio-integrity-fs.c
index 9c5fe5fa8f0d..692403dfa047 100644
--- a/block/bio-integrity-fs.c
+++ b/block/bio-integrity-fs.c
@@ -46,7 +46,8 @@ void fs_bio_integrity_free(struct bio *bio)
 
 void fs_bio_integrity_generate(struct bio *bio)
 {
-	if (fs_bio_integrity_alloc(bio))
+	if (fs_bio_integrity_alloc(bio) &&
+	    (bio_integrity(bio)->bip_flags & BIP_CHECK_FLAGS))
 		bio_integrity_generate(bio);
 }
 EXPORT_SYMBOL_GPL(fs_bio_integrity_generate);
@@ -60,6 +61,9 @@ int fs_bio_integrity_verify(struct bio *bio, sector_t sector, unsigned int size)
 		.bi_size	= size,
 	};
 
+	if (!bip || !(bip->bip_flags & BIP_CHECK_FLAGS))
+		return 0;
+
 	/*
 	 * Reinitialize bip->bip_iter.
 	 *
-- 
2.53.0