From 2831f4d3bfa68e64c5f83e96688be779c87b3511 Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@linaro.org>
Date: Mon, 30 Oct 2023 12:02:59 +0300
Subject: [PATCH] crypto: rsa - add a check for allocation failure
[ Upstream commit d872ca165cb67112f2841ef9c37d51ef7e63d1e4 ]
Static checkers insist that the mpi_alloc() allocation can fail so add
a check to prevent a NULL dereference. Small allocations like this
can't actually fail in current kernels, but adding a check is very
simple and makes the static checkers happy.
Fixes: 6637e11e4ad2 ("crypto: rsa - allow only odd e and restrict value in FIPS mode")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
crypto/rsa.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/crypto/rsa.c b/crypto/rsa.c
index c79613cdce6e..b9cd11fb7d36 100644
--- a/crypto/rsa.c
+++ b/crypto/rsa.c
@@ -220,6 +220,8 @@ static int rsa_check_exponent_fips(MPI e)
}
e_max = mpi_alloc(0);
+ if (!e_max)
+ return -ENOMEM;
mpi_set_bit(e_max, 256);
if (mpi_cmp(e, e_max) >= 0) {