linux-kernel - [PATCH v1 2/2] async_tx: fix possible negative array indexing

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Date:   Tue, 17 Mar 2020 11:45:22 +0530
From:   Rayagonda Kokatanur <rayagonda.kokatanur@...adcom.com>
To:     Dan Williams <dan.j.williams@...el.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Allison Randal <allison@...utok.net>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Rayagonda Kokatanur <rayagonda.kokatanur@...adcom.com>
Subject: [PATCH v1 2/2] async_tx: fix possible negative array indexing

Fix possible negative array index read in __2data_recov_5() function.

Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@...adcom.com>
---
 crypto/async_tx/async_raid6_recov.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crypto/async_tx/async_raid6_recov.c b/crypto/async_tx/async_raid6_recov.c
index 33f2a8f8c9f4..9cd016cb2d09 100644
--- a/crypto/async_tx/async_raid6_recov.c
+++ b/crypto/async_tx/async_raid6_recov.c
@@ -206,7 +206,7 @@ __2data_recov_5(int disks, size_t bytes, int faila, int failb,
 		good_srcs++;
 	}
 
-	if (good_srcs > 1)
+	if ((good_srcs > 1) || (good < 0))
 		return NULL;
 
 	p = blocks[disks-2];
-- 
2.17.1