Commit 41a7848a authored by Namjae Jeon's avatar Namjae Jeon
Browse files

cifsd: add the check if nvec is zero 



Dan Carpenter pointed out that memory can be corrupted when nvec is zero.
This patch add the check to prevent it.

Reviewed-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: default avatarNamjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: default avatarSteve French <stfrench@microsoft.com>
parent 522dcc76

fs/cifsd/auth.c

+3 −0
Original line number Diff line number Diff line
@@ -1172,6 +1172,9 @@ static struct scatterlist *ksmbd_init_sg(struct kvec *iov, unsigned int nvec, 
	unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 24;

	int i, nr_entries[3] = {0}, total_entries = 0, sg_idx = 0;



	if (!nvec)

		return NULL;



	for (i = 0; i < nvec - 1; i++) {

		unsigned long kaddr = (unsigned long)iov[i + 1].iov_base;