linux-kernel - [PATCH v3 01/26] block: Fix a buffer overrun in bio_integrity

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Message-Id: <1348526106-17074-2-git-send-email-koverstreet@google.com>
Date:	Mon, 24 Sep 2012 15:34:41 -0700
From:	Kent Overstreet <koverstreet@...gle.com>
To:	linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com
Cc:	Kent Overstreet <koverstreet@...gle.com>, tj@...nel.org,
	axboe@...nel.dk, neilb@...e.de, vgoyal@...hat.com,
	"Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH v3 01/26] block: Fix a buffer overrun in bio_integrity_split()

bio_integrity_split() seemed to be confusing pointers and arrays -
bip_vec in bio_integrity_payload is an array appended to the end of the
payload, so the bio_vecs in struct bio_pair need to come immediately
after the bio_integrity_payload they're for, and there was an assignment
in bio_integrity_split() that didn't make any sense.

Signed-off-by: Kent Overstreet <koverstreet@...gle.com>
CC: Jens Axboe <axboe@...nel.dk>
CC: Martin K. Petersen <martin.petersen@...cle.com>
---
 fs/bio-integrity.c  | 3 ---
 include/linux/bio.h | 6 ++++--
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/fs/bio-integrity.c b/fs/bio-integrity.c
index a3f28f3..c7b6b52 100644
--- a/fs/bio-integrity.c
+++ b/fs/bio-integrity.c
@@ -697,9 +697,6 @@ void bio_integrity_split(struct bio *bio, struct bio_pair *bp, int sectors)
 	bp->iv1 = bip->bip_vec[0];
 	bp->iv2 = bip->bip_vec[0];
 
-	bp->bip1.bip_vec[0] = bp->iv1;
-	bp->bip2.bip_vec[0] = bp->iv2;
-
 	bp->iv1.bv_len = sectors * bi->tuple_size;
 	bp->iv2.bv_offset += sectors * bi->tuple_size;
 	bp->iv2.bv_len -= sectors * bi->tuple_size;
diff --git a/include/linux/bio.h b/include/linux/bio.h
index b31036f..8e2d108 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -200,8 +200,10 @@ struct bio_pair {
 	struct bio			bio1, bio2;
 	struct bio_vec			bv1, bv2;
 #if defined(CONFIG_BLK_DEV_INTEGRITY)
-	struct bio_integrity_payload	bip1, bip2;
-	struct bio_vec			iv1, iv2;
+	struct bio_integrity_payload	bip1;
+	struct bio_vec			iv1;
+	struct bio_integrity_payload	bip2;
+	struct bio_vec			iv2;
 #endif
 	atomic_t			cnt;
 	int				error;
-- 
1.7.12

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