diff options
| author | Gilad Ben-Yossef <gilad@benyossef.com> | 2018-07-24 15:12:45 +0100 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2018-08-03 18:06:05 +0800 |
| commit | e30368f3f3ee72e20aa4b1fdb6ec2c5ddcd7e2d1 (patch) | |
| tree | cd7737142db38b21aa8975b9ae8db21a9f21ed87 /drivers/crypto | |
| parent | f5c19df90ae7fc21d3dcf50af9d6b456aa6b3351 (diff) | |
crypto: ccree - zero all of request ctx before use
In certain error path req_ctx->iv was being freed despite
not being allocated because it was not initialized to NULL.
Rather than play whack a mole with the structure various
field, zero it before use.
This fixes a kernel panic that may occur if an invalid
buffer size was requested triggering the bug above.
Fixes: 63ee04c8b491 ("crypto: ccree - add skcipher support")
Reported-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto')
| -rw-r--r-- | drivers/crypto/ccree/cc_cipher.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/crypto/ccree/cc_cipher.c b/drivers/crypto/ccree/cc_cipher.c index 64740dd6f5f1..9da0ecce5411 100644 --- a/drivers/crypto/ccree/cc_cipher.c +++ b/drivers/crypto/ccree/cc_cipher.c @@ -767,7 +767,7 @@ static int cc_cipher_encrypt(struct skcipher_request *req) { struct cipher_req_ctx *req_ctx = skcipher_request_ctx(req); - req_ctx->backup_info = NULL; + memset(req_ctx, 0, sizeof(*req_ctx)); return cc_cipher_process(req, DRV_CRYPTO_DIRECTION_ENCRYPT); } @@ -782,6 +782,8 @@ static int cc_cipher_decrypt(struct skcipher_request *req) gfp_t flags = cc_gfp_flags(&req->base); unsigned int len; + memset(req_ctx, 0, sizeof(*req_ctx)); + if (ctx_p->cipher_mode == DRV_CIPHER_CBC) { /* Allocate and save the last IV sized bytes of the source, @@ -794,8 +796,6 @@ static int cc_cipher_decrypt(struct skcipher_request *req) len = req->cryptlen - ivsize; scatterwalk_map_and_copy(req_ctx->backup_info, req->src, len, ivsize, 0); - } else { - req_ctx->backup_info = NULL; } return cc_cipher_process(req, DRV_CRYPTO_DIRECTION_DECRYPT); |