linux-kernel - [PATCH] lib/mpi: potential dereference of null pointer

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Date:   Thu, 16 Dec 2021 15:35:48 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     jiasheng@...as.ac.cn
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] lib/mpi: potential dereference of null pointer

The return value of kcalloc() needs to be checked.
To avoid dereference of null pointer in case of the failure of alloc.

Fixes: a8ea8bdd9df9 ("lib/mpi: Extend the MPI library")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 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