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From:   Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
To:     Dan Williams <dan.j.williams@intel.com>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        "David S . Miller" <davem@davemloft.net>,
        Allison Randal <allison@lohutok.net>,
        Kate Stewart <kstewart@linuxfoundation.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
Subject: [PATCH v1 1/2] async_tx: return error instead of BUG_ON
Date:   Tue, 17 Mar 2020 11:45:21 +0530
Message-Id: <20200317061522.12685-2-rayagonda.kokatanur@broadcom.com>
In-Reply-To: <20200317061522.12685-1-rayagonda.kokatanur@broadcom.com>
References: <20200317061522.12685-1-rayagonda.kokatanur@broadcom.com>
Sender: linux-crypto-owner@vger.kernel.org
Precedence: bulk

Return error upon failure instead of using BUG_ON().
BUG_ON() will crash the kernel.

Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
---
 crypto/async_tx/async_raid6_recov.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/crypto/async_tx/async_raid6_recov.c b/crypto/async_tx/async_raid6_recov.c
index f249142ceac4..33f2a8f8c9f4 100644
--- a/crypto/async_tx/async_raid6_recov.c
+++ b/crypto/async_tx/async_raid6_recov.c
@@ -205,7 +205,9 @@ __2data_recov_5(int disks, size_t bytes, int faila, int failb,
 		good = i;
 		good_srcs++;
 	}
-	BUG_ON(good_srcs > 1);
+
+	if (good_srcs > 1)
+		return NULL;
 
 	p = blocks[disks-2];
 	q = blocks[disks-1];
@@ -339,7 +341,9 @@ async_raid6_2data_recov(int disks, size_t bytes, int faila, int failb,
 	void *scribble = submit->scribble;
 	int non_zero_srcs, i;
 
-	BUG_ON(faila == failb);
+	if (faila == failb)
+		return NULL;
+
 	if (failb < faila)
 		swap(faila, failb);
 
@@ -455,7 +459,8 @@ async_raid6_datap_recov(int disks, size_t bytes, int faila,
 				break;
 		}
 	}
-	BUG_ON(good_srcs == 0);
+	if (good_srcs == 0)
+		return NULL;
 
 	p = blocks[disks-2];
 	q = blocks[disks-1];
-- 
2.17.1