cifs: NULL out tcon, pSesInfo, and srvTcp pointers when chasing DFS referrals
The scenario is this: The kernel gets EREMOTE and starts chasing a DFS referral at mount time. The tcon reference is put, which puts the session reference too, but neither pointer is zeroed out. The mount gets retried (goto try_mount_again) with new mount info. Session setup fails fails and rc ends up being non-zero. The code then falls through to the end and tries to put the previously freed tcon pointer again. Oops at: cifs_put_smb_ses+0x14/0xd0 Fix this by moving the initialization of the rc variable and the tcon, pSesInfo and srvTcp pointers below the try_mount_again label. Also, add a FreeXid() before the goto to prevent xid "leaks". Signed-off-by: NJeff Layton <jlayton@redhat.com> Reported-by: NGustavo Carvalho Homem <gustavo@angulosolido.pt> CC: stable <stable@kernel.org> Signed-off-by: NSteve French <sfrench@us.ibm.com>
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