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Subject[PATCH v1] crypto: mediatek - Add empty messages check in GCM mode
Date
Currently, empty messages are not supported in GCM mode, hence add
a check to prevent producing incorrect results.

Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
---
changes since v1:
- fix build erro: add a missing semicolon.

drivers/crypto/mediatek/mtk-aes.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/crypto/mediatek/mtk-aes.c b/drivers/crypto/mediatek/mtk-aes.c
index 9e845e8..72e4549 100644
--- a/drivers/crypto/mediatek/mtk-aes.c
+++ b/drivers/crypto/mediatek/mtk-aes.c
@@ -928,8 +928,13 @@ static int mtk_aes_gcm_start(struct mtk_cryp *cryp, struct mtk_aes_rec *aes)
static int mtk_aes_gcm_crypt(struct aead_request *req, u64 mode)
{
struct mtk_aes_base_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
+ struct mtk_aes_gcm_ctx *gctx = mtk_aes_gcm_ctx_cast(ctx);
struct mtk_aes_reqctx *rctx = aead_request_ctx(req);

+ /* Empty messages are not supported yet */
+ if (!gctx->textlen && !req->assoclen)
+ return -EINVAL;
+
rctx->mode = AES_FLAGS_GCM | mode;

return mtk_aes_handle_queue(ctx->cryp, !!(mode & AES_FLAGS_ENCRYPT),
--
1.9.1
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