linux-kernel - [PATCH] lib/mpi: Add the return value check of kcalloc()

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Date:   Thu, 30 Dec 2021 15:03:31 +0800
From:   Zizhuang Deng <sunsetdzz@...il.com>
To:     tianjia.zhang@...ux.alibaba.com, herbert@...dor.apana.org.au
Cc:     linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        Zizhuang Deng <sunsetdzz@...il.com>
Subject: [PATCH] lib/mpi: Add the return value check of kcalloc()

Add the return value check of kcalloc() to avoid potential
NULL ptr dereference.

Signed-off-by: Zizhuang Deng <sunsetdzz@...il.com>
---
 lib/mpi/mpi-mod.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/mpi/mpi-mod.c b/lib/mpi/mpi-mod.c
index 47bc59edd4ff..54fcc01564d9 100644
--- a/lib/mpi/mpi-mod.c
+++ b/lib/mpi/mpi-mod.c
@@ -40,6 +40,8 @@ mpi_barrett_t mpi_barrett_init(MPI m, int copy)
 
 	mpi_normalize(m);
 	ctx = kcalloc(1, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return NULL;
 
 	if (copy) {
 		ctx->m = mpi_copy(m);
-- 
2.25.1