linux-kernel - [PATCH] block/bio-integrity: fix mismatched alloc free

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Message-Id: <1566124514-3507-1-git-send-email-bianpan2016@163.com>
Date:   Sun, 18 Aug 2019 18:35:14 +0800
From:   Pan Bian <bianpan2016@....com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Pan Bian <bianpan2016@....com>
Subject: [PATCH] block/bio-integrity: fix mismatched alloc free

The function kmalloc rather than mempool_alloc is called to allocate
memory when the memory pool is unavailable. However, mempool_alloc is
used to release the memory chunck in both cases when error occurs. This
patch fixes the bug.

Signed-off-by: Pan Bian <bianpan2016@....com>
---
 block/bio-integrity.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/block/bio-integrity.c b/block/bio-integrity.c
index fb95dbb..011dfc8 100644
--- a/block/bio-integrity.c
+++ b/block/bio-integrity.c
@@ -75,7 +75,10 @@ struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio,
 
 	return bip;
 err:
-	mempool_free(bip, &bs->bio_integrity_pool);
+	if (!bs || !mempool_initialized(&bs->bio_integrity_pool))
+		kfree(bip);
+	else
+		mempool_free(bip, &bs->bio_integrity_pool);
 	return ERR_PTR(-ENOMEM);
 }
 EXPORT_SYMBOL(bio_integrity_alloc);
-- 
2.7.4