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

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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>
This commit is contained in:
Andrey Ryabinin 2015-09-10 13:11:55 +03:00 committed by Herbert Xu
parent 9da75de030
commit 84cba178a3
1 changed files with 3 additions and 2 deletions
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5
crypto/testmgr.c
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@ -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);