only free in swap_off if allocated.

diff --git a/sys/uvm/uvm_swap.c b/sys/uvm/uvm_swap.c
index c00ccc2..a96536c 100644 (file)
--- a/sys/uvm/uvm_swap.c
+++ b/sys/uvm/uvm_swap.c
@@ -1247,7 +1247,8 @@ swap_off(p, sdp)
        return ENODEV;
 
 #ifdef UVM_SWAP_ENCRYPT
-       free(sdp->swd_decrypt);
+       if (sdp->swd_decrypt)
+               free(sdp->swd_decrypt);
 #endif
        extent_free(swapmap, sdp->swd_mapoffset, sdp->swd_mapsize, EX_WAITOK);
        name = sdp->swd_ex->ex_name;