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([2408:8417:e00:1e5d:c81b:8d5e:98f2:8322]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2698016c076sm25939065ad.42.2025.09.18.05.55.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Sep 2025 05:55:42 -0700 (PDT) From: Guangshuo Li To: =?UTF-8?q?Horia=20Geant=C4=83?= , Pankaj Gupta , Gaurav Jain , Herbert Xu , "David S. Miller" , Meenakshi Aggarwal , Dan Douglass , linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Guangshuo Li , stable@vger.kernel.org Subject: [PATCH] crypto: caam: Add check for kcalloc() in test_len() Date: Thu, 18 Sep 2025 20:55:21 +0800 Message-ID: <20250918125521.3539255-1-lgs201920130244@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" As kcalloc() may fail, check its return value to avoid a NULL pointer dereference when passing the buffer to rng->read() and print_hex_dump_debug(). Fixes: 2be0d806e25e ("crypto: caam - add a test for the RNG") Cc: stable@vger.kernel.org Signed-off-by: Guangshuo Li --- drivers/crypto/caam/caamrng.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/crypto/caam/caamrng.c b/drivers/crypto/caam/caamrng.c index b3d14a7f4dd1..003c5e37acbe 100644 --- a/drivers/crypto/caam/caamrng.c +++ b/drivers/crypto/caam/caamrng.c @@ -181,7 +181,8 @@ static inline void test_len(struct hwrng *rng, size_t l= en, bool wait) struct device *dev =3D ctx->ctrldev; =20 buf =3D kcalloc(CAAM_RNG_MAX_FIFO_STORE_SIZE, sizeof(u8), GFP_KERNEL); - + if (!buf) + return; while (len > 0) { read_len =3D rng->read(rng, buf, len, wait); =20 --=20 2.43.0