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authorHoria Geantă <horia.geanta@nxp.com>2017-02-10 14:07:23 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2017-02-15 13:23:42 +0800
commit87ec02e7409d787348c244039aa3536a812dfa8b (patch)
tree097f6cd4c4ae13bdcd3e9b98b0a8c5a2b7f3f914 /drivers/crypto
parentbbf2234494afd14a720d61a233c21b95e4261326 (diff)
crypto: caam - fix error path for ctx_dma mapping failure
In case ctx_dma dma mapping fails, ahash_unmap_ctx() tries to dma unmap an invalid address: map_seq_out_ptr_ctx() / ctx_map_to_sec4_sg() -> goto unmap_ctx -> -> ahash_unmap_ctx() -> dma unmap ctx_dma There is also possible to reach ahash_unmap_ctx() with ctx_dma uninitialzed or to try to unmap the same address twice. Fix these by setting ctx_dma = 0 where needed: -initialize ctx_dma in ahash_init() -clear ctx_dma in case of mapping error (instead of holding the error code returned by the dma map function) -clear ctx_dma after each unmapping Fixes: 32686d34f8fb6 ("crypto: caam - ensure that we clean up after an error") Signed-off-by: Horia Geantă <horia.geanta@nxp.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto')
-rw-r--r--drivers/crypto/caam/caamhash.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/crypto/caam/caamhash.c b/drivers/crypto/caam/caamhash.c
index 2ad83a8dc0fe..6c6c005f417b 100644
--- a/drivers/crypto/caam/caamhash.c
+++ b/drivers/crypto/caam/caamhash.c
@@ -148,6 +148,7 @@ static inline int map_seq_out_ptr_ctx(u32 *desc, struct device *jrdev,
ctx_len, DMA_FROM_DEVICE);
if (dma_mapping_error(jrdev, state->ctx_dma)) {
dev_err(jrdev, "unable to map ctx\n");
+ state->ctx_dma = 0;
return -ENOMEM;
}
@@ -208,6 +209,7 @@ static inline int ctx_map_to_sec4_sg(u32 *desc, struct device *jrdev,
state->ctx_dma = dma_map_single(jrdev, state->caam_ctx, ctx_len, flag);
if (dma_mapping_error(jrdev, state->ctx_dma)) {
dev_err(jrdev, "unable to map ctx\n");
+ state->ctx_dma = 0;
return -ENOMEM;
}
@@ -482,8 +484,10 @@ static inline void ahash_unmap_ctx(struct device *dev,
struct caam_hash_ctx *ctx = crypto_ahash_ctx(ahash);
struct caam_hash_state *state = ahash_request_ctx(req);
- if (state->ctx_dma)
+ if (state->ctx_dma) {
dma_unmap_single(dev, state->ctx_dma, ctx->ctx_len, flag);
+ state->ctx_dma = 0;
+ }
ahash_unmap(dev, edesc, req, dst_len);
}
@@ -1463,6 +1467,7 @@ static int ahash_init(struct ahash_request *req)
state->finup = ahash_finup_first;
state->final = ahash_final_no_ctx;
+ state->ctx_dma = 0;
state->current_buf = 0;
state->buf_dma = 0;
state->buflen_0 = 0;