fs/cifs/smb2pdu.c: fix buffer free in SMB2_ioctl_free
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: 2c87d6a9 ("cifs: Allocate memory for all iovs in smb2_ioctl") Signed-off-by: NMurphy Zhou <jencce.kernel@gmail.com> Signed-off-by: NSteve French <stfrench@microsoft.com> Reviewed-by: NRonnie sahlberg <lsahlber@redhat.com>
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