From abfa7f4357e3640fdee87dfc276fd0f379fb5ae6 Mon Sep 17 00:00:00 2001 From: Jerome Marchand Date: Wed, 3 Feb 2016 13:58:12 +0100 Subject: [PATCH] crypto: testmgr - fix out of bound read in __test_aead() __test_aead() reads MAX_IVLEN bytes from template[i].iv, but the actual length of the initialisation vector can be shorter. The length of the IV is already calculated earlier in the function. Let's just reuses that. Also the IV length is currently calculated several time for no reason. Let's fix that too. This fix an out-of-bound error detected by KASan. Signed-off-by: Jerome Marchand Signed-off-by: Herbert Xu --- crypto/testmgr.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/crypto/testmgr.c b/crypto/testmgr.c index cde6a2983937..54681838da6c 100644 --- a/crypto/testmgr.c +++ b/crypto/testmgr.c @@ -613,6 +613,8 @@ static int __test_aead(struct crypto_aead *tfm, int enc, aead_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG, tcrypt_complete, &result); + iv_len = crypto_aead_ivsize(tfm); + for (i = 0, j = 0; i < tcount; i++) { if (template[i].np) continue; @@ -633,7 +635,6 @@ static int __test_aead(struct crypto_aead *tfm, int enc, memcpy(input, template[i].input, template[i].ilen); memcpy(assoc, template[i].assoc, template[i].alen); - iv_len = crypto_aead_ivsize(tfm); if (template[i].iv) memcpy(iv, template[i].iv, iv_len); else @@ -742,7 +743,7 @@ static int __test_aead(struct crypto_aead *tfm, int enc, j++; if (template[i].iv) - memcpy(iv, template[i].iv, MAX_IVLEN); + memcpy(iv, template[i].iv, iv_len); else memset(iv, 0, MAX_IVLEN); -- 2.20.1