The sg_nents_for_len() function could fail, this patch add a check for
its return value.
Signed-off-by: LABBE Corentin <clabbe.montj...@gmail.com>
---
drivers/crypto/talitos.c | 41 ++++++++++++++++++++++++++++++++++-------
1 file changed, 34 insertions(+), 7 deletions(-)
diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
index 46f531e..898ab6c 100644
--- a/drivers/crypto/talitos.c
+++ b/drivers/crypto/talitos.c
@@ -1216,6 +1216,7 @@ static struct talitos_edesc *talitos_edesc_alloc(struct
device *dev,
struct talitos_private *priv = dev_get_drvdata(dev);
bool is_sec1 = has_ftr_sec1(priv);
int max_len = is_sec1 ? TALITOS1_MAX_DATA_LEN : TALITOS2_MAX_DATA_LEN;
+ void *err;
if (cryptlen + authsize > max_len) {
dev_err(dev, "length exceeds h/w max limit\n");
@@ -1228,14 +1229,29 @@ static struct talitos_edesc *talitos_edesc_alloc(struct
device *dev,
if (!dst || dst == src) {
src_nents = sg_nents_for_len(src,
assoclen + cryptlen + authsize);
+ if (src_nents < 0) {
+ dev_err(dev, "Invalid number of src SG.\n");
+ err = ERR_PTR(-EINVAL);
+ goto error_sg;
+ }
src_nents = (src_nents == 1) ? 0 : src_nents;
dst_nents = dst ? src_nents : 0;
} else { /* dst && dst != src*/
src_nents = sg_nents_for_len(src, assoclen + cryptlen +
(encrypt ? 0 : authsize));
+ if (src_nents < 0) {
+ dev_err(dev, "Invalid number of src SG.\n");
+ err = ERR_PTR(-EINVAL);
+ goto error_sg;
+ }
src_nents = (src_nents == 1) ? 0 : src_nents;
dst_nents = sg_nents_for_len(dst, assoclen + cryptlen +
(encrypt ? authsize : 0));
+ if (dst_nents < 0) {
+ dev_err(dev, "Invalid number of dst SG.\n");
+ err = ERR_PTR(-EINVAL);
+ goto error_sg;
+ }
dst_nents = (dst_nents == 1) ? 0 : dst_nents;
}
@@ -1260,11 +1276,9 @@ static struct talitos_edesc *talitos_edesc_alloc(struct
device *dev,
edesc = kmalloc(alloc_len, GFP_DMA | flags);
if (!edesc) {
- if (iv_dma)
- dma_unmap_single(dev, iv_dma, ivsize, DMA_TO_DEVICE);
-
dev_err(dev, "could not allocate edescriptor\n");
- return ERR_PTR(-ENOMEM);
+ err = ERR_PTR(-ENOMEM);
+ goto error_sg;
}
edesc->src_nents = src_nents;
@@ -1277,6 +1291,10 @@ static struct talitos_edesc *talitos_edesc_alloc(struct
device *dev,
DMA_BIDIRECTIONAL);
return edesc;
+error_sg:
+ if (iv_dma)
+ dma_unmap_single(dev, iv_dma, ivsize, DMA_TO_DEVICE);
+ return err;
}
static struct talitos_edesc *aead_edesc_alloc(struct aead_request *areq, u8
*iv,
@@ -1830,11 +1848,16 @@ static int ahash_process_req(struct ahash_request
*areq, unsigned int nbytes)
unsigned int nbytes_to_hash;
unsigned int to_hash_later;
unsigned int nsg;
+ int nents;
if (!req_ctx->last && (nbytes + req_ctx->nbuf <= blocksize)) {
/* Buffer up to one whole block */
- sg_copy_to_buffer(areq->src,
- sg_nents_for_len(areq->src, nbytes),
+ nents = sg_nents_for_len(areq->src, nbytes);
+ if (nents < 0) {
+ dev_err(ctx->dev, "Invalid number of src SG.\n");
+ return nents;
+ }
+ sg_copy_to_buffer(areq->src, nents,
req_ctx->buf + req_ctx->nbuf, nbytes);
req_ctx->nbuf += nbytes;
return 0;
@@ -1867,7 +1890,11 @@ static int ahash_process_req(struct ahash_request *areq,
unsigned int nbytes)
req_ctx->psrc = areq->src;
if (to_hash_later) {
- int nents = sg_nents_for_len(areq->src, nbytes);
+ nents = sg_nents_for_len(areq->src, nbytes);
+ if (nents < 0) {
+ dev_err(ctx->dev, "Invalid number of src SG.\n");
+ return nents;
+ }
sg_pcopy_to_buffer(areq->src, nents,
req_ctx->bufnext,
to_hash_later,
--
2.4.10
--
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