[PATCH] fs/cifs/smb2pdu.c: fix buffer free in SMB2_ioctl_free

[Murphy Zhou <jencce.kernel@gmail.com>]

The 2nd buffer could be NULL even if iov_len is not zero. This can
trigger a panic when handling symlinks. It's easy to reproduce with
LTP fs_racer scripts[1] which are randomly craete/delete/link files
and dirs. Fix this panic by checking if the 2nd buffer is padding
before kfree, like what we do in SMB2_open_free.

[1] https://github.com/linux-test-project/ltp/tree/master/testcases/kernel/fs/racer

Fixes: 2c87d6a ("cifs: Allocate memory for all iovs in smb2_ioctl")
Signed-off-by: Murphy Zhou <jencce.kernel@gmail.com>
---
 fs/cifs/smb2pdu.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 710ceb8..c36f940 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -2619,10 +2619,12 @@ int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
 void
 SMB2_ioctl_free(struct smb_rqst *rqst)
 {
+	int i;
 	if (rqst && rqst->rq_iov) {
 		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
-		if (rqst->rq_iov[1].iov_len)
-			kfree(rqst->rq_iov[1].iov_base);
+		for (i = 1; i < rqst->rq_nvec; i++)
+			if (rqst->rq_iov[i].iov_base != smb2_padding)
+				kfree(rqst->rq_iov[i].iov_base);
 	}
 }
 
-- 
1.8.3.1