Commit 1fb37b56 authored by Gilad Ben-Yossef's avatar Gilad Ben-Yossef Committed by Herbert Xu
Browse files

crypto: ccree - don't attempt 0 len DMA mappings 



Refuse to try mapping zero bytes as this may cause a fault
on some configurations / platforms and it seems the prev.
attempt is not enough and we need to be more explicit.

Signed-off-by: default avatarGilad Ben-Yossef <gilad@benyossef.com>
Reported-by: default avatarCorentin Labbe <clabbe.montjoie@gmail.com>
Fixes: ce0fc6db ("crypto: ccree - protect against empty or NULL
scatterlists")
Tested-by: default avatarCorentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent c143a603

drivers/crypto/ccree/cc_buffer_mgr.c

+7 −0
Original line number Diff line number Diff line
@@ -258,6 +258,13 @@ static int cc_map_sg(struct device *dev, struct scatterlist *sg, 
{

	int ret = 0;



	if (!nbytes) {

		*mapped_nents = 0;

		*lbytes = 0;

		*nents = 0;

		return 0;

	}



	*nents = cc_get_sgl_nents(dev, sg, nbytes, lbytes);

	if (*nents > max_sg_nents) {

		*nents = 0;