diff options
author | Tom Lendacky <thomas.lendacky@amd.com> | 2016-02-02 11:38:21 -0600 |
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committer | Herbert Xu <herbert@gondor.apana.org.au> | 2016-02-06 15:33:24 +0800 |
commit | b31dde2a5cb1bf764282abf934266b7193c2bc7c (patch) | |
tree | e80308430723067da1984e396bf14f377f42c91f /drivers/crypto/ccp/ccp-crypto-aes-cmac.c | |
parent | fd09967b830c9ed60f53f318ee67907803065c9c (diff) | |
download | linux-b31dde2a5cb1bf764282abf934266b7193c2bc7c.tar.gz linux-b31dde2a5cb1bf764282abf934266b7193c2bc7c.tar.bz2 linux-b31dde2a5cb1bf764282abf934266b7193c2bc7c.zip |
crypto: ccp - Don't assume export/import areas are aligned
Use a local variable for the exported and imported state so that
alignment is not an issue. On export, set a local variable from the
request context and then memcpy the contents of the local variable to
the export memory area. On import, memcpy the import memory area into
a local variable and then use the local variable to set the request
context.
Cc: <stable@vger.kernel.org> # 3.14.x-
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/ccp/ccp-crypto-aes-cmac.c')
-rw-r--r-- | drivers/crypto/ccp/ccp-crypto-aes-cmac.c | 26 |
1 files changed, 16 insertions, 10 deletions
diff --git a/drivers/crypto/ccp/ccp-crypto-aes-cmac.c b/drivers/crypto/ccp/ccp-crypto-aes-cmac.c index 6a2d836eb2d9..d095452b8828 100644 --- a/drivers/crypto/ccp/ccp-crypto-aes-cmac.c +++ b/drivers/crypto/ccp/ccp-crypto-aes-cmac.c @@ -223,12 +223,15 @@ static int ccp_aes_cmac_digest(struct ahash_request *req) static int ccp_aes_cmac_export(struct ahash_request *req, void *out) { struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req); - struct ccp_aes_cmac_exp_ctx *state = out; + struct ccp_aes_cmac_exp_ctx state; - state->null_msg = rctx->null_msg; - memcpy(state->iv, rctx->iv, sizeof(state->iv)); - state->buf_count = rctx->buf_count; - memcpy(state->buf, rctx->buf, sizeof(state->buf)); + state.null_msg = rctx->null_msg; + memcpy(state.iv, rctx->iv, sizeof(state.iv)); + state.buf_count = rctx->buf_count; + memcpy(state.buf, rctx->buf, sizeof(state.buf)); + + /* 'out' may not be aligned so memcpy from local variable */ + memcpy(out, &state, sizeof(state)); return 0; } @@ -236,12 +239,15 @@ static int ccp_aes_cmac_export(struct ahash_request *req, void *out) static int ccp_aes_cmac_import(struct ahash_request *req, const void *in) { struct ccp_aes_cmac_req_ctx *rctx = ahash_request_ctx(req); - const struct ccp_aes_cmac_exp_ctx *state = in; + struct ccp_aes_cmac_exp_ctx state; + + /* 'in' may not be aligned so memcpy to local variable */ + memcpy(&state, in, sizeof(state)); - rctx->null_msg = state->null_msg; - memcpy(rctx->iv, state->iv, sizeof(rctx->iv)); - rctx->buf_count = state->buf_count; - memcpy(rctx->buf, state->buf, sizeof(rctx->buf)); + rctx->null_msg = state.null_msg; + memcpy(rctx->iv, state.iv, sizeof(rctx->iv)); + rctx->buf_count = state.buf_count; + memcpy(rctx->buf, state.buf, sizeof(rctx->buf)); return 0; } |