Guard against corruption of top half of %esp during UNDI ISR

diff --git a/src/arch/i386/drivers/net/undiisr.S b/src/arch/i386/drivers/net/undiisr.S
index f1c9eb1547cda5fc48279be1d2d5e976b31e6328..a6c6c381e4e402ea29b40acb0ddd5fc2aad3563a 100644 (file)
--- a/src/arch/i386/drivers/net/undiisr.S
+++ b/src/arch/i386/drivers/net/undiisr.S
@@ -64,7 +64,10 @@ chain:       /* Chain to next handler */
        lcall   *undiisr_next_handler
        
 exit:  /* Restore registers and return */
+       cli
        popal
+       movzwl  %sp, %esp
+       addr32  movl -20(%esp), %esp    /* %esp isn't restored by popal */
        popfl
        popw    %gs
        popw    %fs