RE: [PATCH 1/1] crypto: If two strings are exact match, they must have same length.

When both "crct10dif-pclmul" algorithm and "crct10dif-generic" 
algorithm exist in crypto_alg_list, "crct10dif-pclmul" should be 
selected, since it has higher priority than "crct10dif-generic". 
However, both algorithms have the same cra_name "crct10dif". If we use 
"crct10dif" to find a matched algorithm in crypto_alg_list, it's 
possible "crct10dif-generic" is selected, because the code calls 
strcmp to decide if two string are exact match, but doesn't check if two strings have the same length.

exact = !strcmp(q->cra_driver_name, name);

So ,if "crct10dif-generic" is in front of "crct10dif-pclmul" in 
crypto_alg_list, it will be picked as the matched algorithm, even if 
it has lower priority than "crct10dif-pclmul".
Signed-off-by: Ming Ma <redacted>
---
 crypto/api.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/crypto/api.c b/crypto/api.c index b16ce16..5b3d45a 100644
--- a/crypto/api.c
+++ b/crypto/api.c

@@ -76,7 +76,8 @@ static struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type,
 		    ((struct crypto_larval *)q)->mask != mask)
 			continue;
 
-		exact = !strcmp(q->cra_driver_name, name);
+		exact = (strlen(name) == strlen(q->cra_driver_name)) &&
+				!strcmp(q->cra_driver_name, name);
 		fuzzy = !strcmp(q->cra_name, name);
 		if (!exact && !(fuzzy && q->cra_priority > best))
 			continue;