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crypto: shash - fix missed optimization in shash_ahash_digest()

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shash_ahash_digest(), which is the ->digest() method for ahash tfms that
use an shash algorithm, has an optimization where crypto_shash_digest()
is called if the data is in a single page.  But an off-by-one error
prevented this path from being taken unless the user happened to provide
extra data in the scatterlist.  Fix it.

Signed-off-by: Eric Biggers <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
This commit is contained in:
Eric Biggers 2019-04-14 16:23:33 -07:00 • committed by Herbert Xu
commit 67cb60e4ef
1 changed files with 1 additions and 1 deletions
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crypto/shash.c
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@ -307,7 +307,7 @@ int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
if (nbytes &&
(sg = req->src, offset = sg->offset,
nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
nbytes <= min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
void *data;
data = kmap_atomic(sg_page(sg));