linux-kernel - [PATCH] crypto: caam: Add check for kcalloc() in test

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Message-ID: <20250918125521.3539255-1-lgs201920130244@gmail.com>
Date: Thu, 18 Sep 2025 20:55:21 +0800
From: Guangshuo Li <lgs201920130244@...il.com>
To: Horia Geantă <horia.geanta@....com>,
	Pankaj Gupta <pankaj.gupta@....com>,
	Gaurav Jain <gaurav.jain@....com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	Meenakshi Aggarwal <meenakshi.aggarwal@....com>,
	Dan Douglass <dan.douglass@....com>,
	linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Guangshuo Li <lgs201920130244@...il.com>,
	stable@...r.kernel.org
Subject: [PATCH] crypto: caam: Add check for kcalloc() in test_len()

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@...r.kernel.org
Signed-off-by: Guangshuo Li <lgs201920130244@...il.com>
---
 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 len, bool wait)
 	struct device *dev = ctx->ctrldev;
 
 	buf = kcalloc(CAAM_RNG_MAX_FIFO_STORE_SIZE, sizeof(u8), GFP_KERNEL);
-
+	if (!buf)
+		return;
 	while (len > 0) {
 		read_len = rng->read(rng, buf, len, wait);
 
-- 
2.43.0