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cifsd: add the check if nvec is zero

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

Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Namjae Jeon 2021-05-26 15:31:37 +09:00
parent 522dcc7626
commit 41a7848a01
1 changed files with 3 additions and 0 deletions
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3
fs/cifsd/auth.c
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@ -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;