From: Zizhuang Deng <sunsetdzz@gmail.com>
Date: Thu, 30 Dec 2021 07:03:31 +0000 (+0800)
Subject: lib/mpi: Add the return value check of kcalloc()
X-Git-Tag: Ubuntu-5.15.0-19.19~500
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=adb508a1b6ac4037c9d53153114aba45d90e8e96;p=mirror_ubuntu-jammy-kernel.git

lib/mpi: Add the return value check of kcalloc()

BugLink: https://bugs.launchpad.net/bugs/1959376

[ Upstream commit dd827abe296fe4249b2f8c9b95f72f814ea8348c ]

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

Fixes: a8ea8bdd9df9 ("lib/mpi: Extend the MPI library")
Signed-off-by: Zizhuang Deng <sunsetdzz@gmail.com>
Reviewed-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>
---

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);