crypto: testmgr - don't copy from source IV too much

While the destination buffer 'iv' is MAX_IVLEN size,
the source 'template[i].iv' could be smaller, thus
memcpy may read read invalid memory.
Use crypto_skcipher_ivsize() to get real ivsize
and pass it to memcpy.

Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index 35c2de1..fa18753 100644 (file)
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -940,6 +940,7 @@ static int __test_skcipher(struct crypto_skcipher *tfm, int enc,
        char *xbuf[XBUFSIZE];
        char *xoutbuf[XBUFSIZE];
        int ret = -ENOMEM;
+       unsigned int ivsize = crypto_skcipher_ivsize(tfm);
 
        if (testmgr_alloc_buf(xbuf))
                goto out_nobuf;
@@ -975,7 +976,7 @@ static int __test_skcipher(struct crypto_skcipher *tfm, int enc,
                        continue;
 
                if (template[i].iv)
-                       memcpy(iv, template[i].iv, MAX_IVLEN);
+                       memcpy(iv, template[i].iv, ivsize);
                else
                        memset(iv, 0, MAX_IVLEN);
 
@@ -1051,7 +1052,7 @@ static int __test_skcipher(struct crypto_skcipher *tfm, int enc,
                        continue;
 
                if (template[i].iv)
-                       memcpy(iv, template[i].iv, MAX_IVLEN);
+                       memcpy(iv, template[i].iv, ivsize);
                else
                        memset(iv, 0, MAX_IVLEN);