[PATCH v2] crypto: testmgr: change `guard` to unsigned char

[Joey Pabalinas <joeypabalinas@gmail.com>]

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When char is signed, storing the values 0xba (186) and 0xad (173) in the
`guard` array produces signed overflow. Change the type of `guard` to
static unsigned char to correct undefined behavior and reduce function
stack usage.

Signed-off-by: Joey Pabalinas <joeypabalinas@gmail.com>
---
 crypto/testmgr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index 29d7020b8826faa3f0..44a85d4b3561acbca6 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -185,7 +185,7 @@ static int ahash_partial_update(struct ahash_request **preq,
 	char *state;
 	struct ahash_request *req;
 	int statesize, ret = -EINVAL;
-	const char guard[] = { 0x00, 0xba, 0xad, 0x00 };
+	static const unsigned char guard[] = { 0x00, 0xba, 0xad, 0x00 };
 
 	req = *preq;
 	statesize = crypto_ahash_statesize(
-- 
2.15.1

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