As kcalloc() may fail, check its return value to avoid a NULL pointer
dereference when passing the buffer to rng->read(). On allocation
failure, log the error and return since test_len() returns void.
Fixes: 2be0d806e25e ("crypto: caam - add a test for the RNG")
Cc: stable@vger.kernel.org
Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
---
changelog:
v3:
- Fix build error: test_len() returns void; return without a value.
- No functional changes beyond the allocation failure path.
v2:
- Return on allocation failure to avoid possible NULL dereference.
---
drivers/crypto/caam/caamrng.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/crypto/caam/caamrng.c b/drivers/crypto/caam/caamrng.c
index b3d14a7f4dd1..0eb43c862516 100644
--- a/drivers/crypto/caam/caamrng.c
+++ b/drivers/crypto/caam/caamrng.c
@@ -181,7 +181,9 @@ 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