ash: do not let EXIT trap to fire in `trap`

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/shell/ash.c b/shell/ash.c
index 597bc2808..47f968b54 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -4525,7 +4525,7 @@ clear_traps(void)
                         INT_OFF;
                         free(*tp);
                         *tp = NULL;
-                        if (tp != &trap[0])
+                        if ((tp - trap) != 0)
                                 setsignal(tp - trap);
                         INT_ON;
                 }
@@ -4596,6 +4596,8 @@ forkchild(struct job *jp, union node *n, int mode)
                  *
                  * Our solution: ONLY bare $(trap) or `trap` is special.
                  */
+                free(trap[0]); /* Prevent EXIT trap from firing in `trap` */
+                trap[0] = NULL;
         } else {
                 clear_traps();
         }
@@ -13023,6 +13025,7 @@ exitshell(void)
         if (p) {
                 trap[0] = NULL;
                 evalstring(p, 0);
+                free(p);
         }
         flush_stdout_stderr();
  out: