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 lgs201920130244@gmail.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);