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nfsd: don't allow zero length strings in cache_parse()

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There is no point in passing a zero length string here and quite a
few of that cache_parse() implementations will Oops if count is
zero.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: stable@kernel.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Dan Carpenter 2012-01-18 12:56:02 +03:00 committed by J. Bruce Fields
parent 62aa2b537c
commit 6d8d174998
1 changed files with 2 additions and 0 deletions
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2
net/sunrpc/cache.c
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@ -828,6 +828,8 @@ static ssize_t cache_do_downcall(char *kaddr, const char __user *buf,
{
ssize_t ret;
if (count == 0)
return -EINVAL;
if (copy_from_user(kaddr, buf, count))
return -EFAULT;
kaddr[count] = '\0';