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crypto: caam - fix DMA API mapping leak in ablkcipher code 

alkcipher_edesc_alloc() and ablkcipher_giv_edesc_alloc() don't
free / unmap resources on error path:
- dmap_map_sg() could fail, thus make sure the return value is checked
- unmap DMA mappings in case of error

Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Horia Geantă 2016-11-09 10:46:20 +02:00 committed by Herbert Xu
parent 9305dff7ab
commit c73e36e82b
1 changed files with 44 additions and 0 deletions
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44
drivers/crypto/caam/caamalg.c
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@ -2600,16 +2600,33 @@ static struct ablkcipher_edesc *ablkcipher_edesc_alloc(struct ablkcipher_request
if (likely(req->src == req->dst)) {
sgc = dma_map_sg(jrdev, req->src, src_nents ? : 1,
DMA_BIDIRECTIONAL);
if (unlikely(!sgc)) {
dev_err(jrdev, "unable to map source\n");
return ERR_PTR(-ENOMEM);
}
} else {
sgc = dma_map_sg(jrdev, req->src, src_nents ? : 1,
DMA_TO_DEVICE);
if (unlikely(!sgc)) {
dev_err(jrdev, "unable to map source\n");
return ERR_PTR(-ENOMEM);
}
sgc = dma_map_sg(jrdev, req->dst, dst_nents ? : 1,
DMA_FROM_DEVICE);
if (unlikely(!sgc)) {
dev_err(jrdev, "unable to map destination\n");
dma_unmap_sg(jrdev, req->src, src_nents ? : 1,
DMA_TO_DEVICE);
return ERR_PTR(-ENOMEM);
}
}
iv_dma = dma_map_single(jrdev, req->info, ivsize, DMA_TO_DEVICE);
if (dma_mapping_error(jrdev, iv_dma)) {
dev_err(jrdev, "unable to map IV\n");
caam_unmap(jrdev, req->src, req->dst, src_nents, dst_nents, 0,
0, 0, 0);
return ERR_PTR(-ENOMEM);
}
@ -2629,6 +2646,8 @@ static struct ablkcipher_edesc *ablkcipher_edesc_alloc(struct ablkcipher_request
GFP_DMA | flags);
if (!edesc) {
dev_err(jrdev, "could not allocate extended descriptor\n");
caam_unmap(jrdev, req->src, req->dst, src_nents, dst_nents,
iv_dma, ivsize, 0, 0);
return ERR_PTR(-ENOMEM);
}
@ -2655,6 +2674,9 @@ static struct ablkcipher_edesc *ablkcipher_edesc_alloc(struct ablkcipher_request
sec4_sg_bytes, DMA_TO_DEVICE);
if (dma_mapping_error(jrdev, edesc->sec4_sg_dma)) {
dev_err(jrdev, "unable to map S/G table\n");
caam_unmap(jrdev, req->src, req->dst, src_nents, dst_nents,
iv_dma, ivsize, 0, 0);
kfree(edesc);
return ERR_PTR(-ENOMEM);
}
@ -2776,11 +2798,26 @@ static struct ablkcipher_edesc *ablkcipher_giv_edesc_alloc(
if (likely(req->src == req->dst)) {
sgc = dma_map_sg(jrdev, req->src, src_nents ? : 1,
DMA_BIDIRECTIONAL);
if (unlikely(!sgc)) {
dev_err(jrdev, "unable to map source\n");
return ERR_PTR(-ENOMEM);
}
} else {
sgc = dma_map_sg(jrdev, req->src, src_nents ? : 1,
DMA_TO_DEVICE);
if (unlikely(!sgc)) {
dev_err(jrdev, "unable to map source\n");
return ERR_PTR(-ENOMEM);
}
sgc = dma_map_sg(jrdev, req->dst, dst_nents ? : 1,
DMA_FROM_DEVICE);
if (unlikely(!sgc)) {
dev_err(jrdev, "unable to map destination\n");
dma_unmap_sg(jrdev, req->src, src_nents ? : 1,
DMA_TO_DEVICE);
return ERR_PTR(-ENOMEM);
}
}
/*
@ -2790,6 +2827,8 @@ static struct ablkcipher_edesc *ablkcipher_giv_edesc_alloc(
iv_dma = dma_map_single(jrdev, greq->giv, ivsize, DMA_TO_DEVICE);
if (dma_mapping_error(jrdev, iv_dma)) {
dev_err(jrdev, "unable to map IV\n");
caam_unmap(jrdev, req->src, req->dst, src_nents, dst_nents, 0,
0, 0, 0);
return ERR_PTR(-ENOMEM);
}
@ -2805,6 +2844,8 @@ static struct ablkcipher_edesc *ablkcipher_giv_edesc_alloc(
GFP_DMA | flags);
if (!edesc) {
dev_err(jrdev, "could not allocate extended descriptor\n");
caam_unmap(jrdev, req->src, req->dst, src_nents, dst_nents,
iv_dma, ivsize, 0, 0);
return ERR_PTR(-ENOMEM);
}
@ -2832,6 +2873,9 @@ static struct ablkcipher_edesc *ablkcipher_giv_edesc_alloc(
sec4_sg_bytes, DMA_TO_DEVICE);
if (dma_mapping_error(jrdev, edesc->sec4_sg_dma)) {
dev_err(jrdev, "unable to map S/G table\n");
caam_unmap(jrdev, req->src, req->dst, src_nents, dst_nents,
iv_dma, ivsize, 0, 0);
kfree(edesc);
return ERR_PTR(-ENOMEM);
}
edesc->iv_dma = iv_dma;