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

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[ Upstream commit 1fb37b5692c915edcc2448a6b37255738c7c77e0 ]

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: Gilad Ben-Yossef <gilad@benyossef.com>
Reported-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Fixes: ce0fc6db38de ("crypto: ccree - protect against empty or NULL
scatterlists")
Tested-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Gilad Ben-Yossef 2022-02-17 21:27:26 +02:00 committed by Greg Kroah-Hartman
parent c3a5acf91c
commit 40e6d5d1de
1 changed files with 7 additions and 0 deletions
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7
drivers/crypto/ccree/cc_buffer_mgr.c
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@ -295,6 +295,13 @@ 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;