patch 8.2.3756: might crash when callback is not validv8.2.3756

Problem:    might crash when callback is not valid.
Solution:   Check for valid callback. (Yegappan Lakshmanan, closes #9293)

1 files changed, 3 insertions, 2 deletions

diff --git a/src/job.c b/src/job.c
index ebe902fb04..6ee9f4432e 100644
--- a/src/job.c
+++ b/src/job.c
@@ -1578,6 +1578,7 @@ invoke_prompt_interrupt(void)
 {
     typval_T	rettv;
     typval_T	argv[1];
+    int		ret;
 
     if (curbuf->b_prompt_interrupt.cb_name == NULL
 	    || *curbuf->b_prompt_interrupt.cb_name == NUL)
@@ -1585,9 +1586,9 @@ invoke_prompt_interrupt(void)
     argv[0].v_type = VAR_UNKNOWN;
 
     got_int = FALSE; // don't skip executing commands
-    call_callback(&curbuf->b_prompt_interrupt, -1, &rettv, 0, argv);
+    ret = call_callback(&curbuf->b_prompt_interrupt, -1, &rettv, 0, argv);
     clear_tv(&rettv);
-    return TRUE;
+    return ret == FAIL ? FALSE : TRUE;
 }
 
 /*