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authorPatrick McHardy <kaber@trash.net>2008-05-07 22:34:27 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2008-07-10 20:35:11 +0800
commit136f702f51a4bfa38003660768e7153823fff8a1 (patch)
tree61bd60f542dcaf74419d47a7d5866138727bb566 /drivers
parentd069033b42b392662320f71e319296a14d57ff3a (diff)
downloadlinux-linaro-stable-136f702f51a4bfa38003660768e7153823fff8a1.tar.gz
[HIFN]: Properly handle requests for less than the full scatterlist
The scatterlist may contain more data than the crypto request, causing an underflow of the remaining byte count while walking the list. Use the minimum of the scatterlist element size and the remaining byte count specified in the crypto request to avoid this. Signed-off-by: Patrick McHardy <kaber@trash.net> Acked-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/crypto/hifn_795x.c20
1 files changed, 10 insertions, 10 deletions
diff --git a/drivers/crypto/hifn_795x.c b/drivers/crypto/hifn_795x.c
index 4428e8e68a0d..366e974d0e59 100644
--- a/drivers/crypto/hifn_795x.c
+++ b/drivers/crypto/hifn_795x.c
@@ -1433,7 +1433,7 @@ static int ablkcipher_add(void *daddr, unsigned int *drestp, struct scatterlist
return -EINVAL;
while (size) {
- copy = min(drest, src->length);
+ copy = min(drest, min(size, src->length));
saddr = kmap_atomic(sg_page(src), KM_SOFTIRQ1);
memcpy(daddr, saddr + src->offset, copy);
@@ -1482,7 +1482,7 @@ static int ablkcipher_walk(struct ablkcipher_request *req,
if (!IS_ALIGNED(dst->offset, HIFN_D_DST_DALIGN) ||
!IS_ALIGNED(dst->length, HIFN_D_DST_DALIGN) ||
offset) {
- unsigned slen = src->length - offset;
+ unsigned slen = min(src->length - offset, nbytes);
unsigned dlen = PAGE_SIZE;
t = &w->cache[idx];
@@ -1540,7 +1540,7 @@ static int ablkcipher_walk(struct ablkcipher_request *req,
kunmap_atomic(daddr, KM_SOFTIRQ0);
} else {
- nbytes -= src->length;
+ nbytes -= min(src->length, nbytes);
idx++;
}
@@ -1559,7 +1559,7 @@ static int hifn_setup_session(struct ablkcipher_request *req)
struct hifn_context *ctx = crypto_tfm_ctx(req->base.tfm);
struct hifn_device *dev = ctx->dev;
struct page *spage, *dpage;
- unsigned long soff, doff, flags;
+ unsigned long soff, doff, dlen, flags;
unsigned int nbytes = req->nbytes, idx = 0, len;
int err = -EINVAL, sg_num;
struct scatterlist *src, *dst, *t;
@@ -1571,12 +1571,13 @@ static int hifn_setup_session(struct ablkcipher_request *req)
while (nbytes) {
dst = &req->dst[idx];
+ dlen = min(dst->length, nbytes);
if (!IS_ALIGNED(dst->offset, HIFN_D_DST_DALIGN) ||
- !IS_ALIGNED(dst->length, HIFN_D_DST_DALIGN))
+ !IS_ALIGNED(dlen, HIFN_D_DST_DALIGN))
ctx->walk.flags |= ASYNC_FLAGS_MISALIGNED;
- nbytes -= dst->length;
+ nbytes -= dlen;
idx++;
}
@@ -1631,7 +1632,7 @@ static int hifn_setup_session(struct ablkcipher_request *req)
if (err)
goto err_out;
- nbytes -= len;
+ nbytes -= min(len, nbytes);
}
dev->active = HIFN_DEFAULT_ACTIVE_NUM;
@@ -1736,8 +1737,7 @@ static int ablkcipher_get(void *saddr, unsigned int *srestp, unsigned int offset
return -EINVAL;
while (size) {
-
- copy = min(dst->length, srest);
+ copy = min(srest, min(dst->length, size));
daddr = kmap_atomic(sg_page(dst), KM_IRQ0);
memcpy(daddr + dst->offset + offset, saddr, copy);
@@ -1794,7 +1794,7 @@ static void hifn_process_ready(struct ablkcipher_request *req, int error)
sg_page(dst), dst->length, nbytes);
if (!t->length) {
- nbytes -= dst->length;
+ nbytes -= min(dst->length, nbytes);
idx++;
continue;
}