dc: Fix segfault when executing strings generated using asciify

function                                             old     new   delta
zxc_vm_process                                      6884    6891      +7

Signed-off-by: Brian Foley <bpfoley@google.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/miscutils/bc.c b/miscutils/bc.c
index 9a9880706..44c70cac3 100644
--- a/miscutils/bc.c
+++ b/miscutils/bc.c
@@ -4973,7 +4973,9 @@ static void dc_parse_string(void)
         xc_parse_pushInst_and_Index(XC_INST_STR, len);
         bc_vec_push(&G.prog.strs, &str);
 
-        // Explanation needed here
+        // Add an empty function so that if zdc_program_execStr ever needs to
+        // parse the string into code (from the 'x' command) there's somewhere
+        // to store the bytecode.
         xc_program_add_fn();
         p->func = xc_program_func(p->fidx);
 
@@ -6398,7 +6400,11 @@ static BC_STATUS zdc_program_asciify(void)
         str = xzalloc(2);
         str[0] = c;
         //str[1] = '\0'; - already is
-        bc_vec_push(&G.prog.strs, &str);
+        idx = bc_vec_push(&G.prog.strs, &str);
+        // Add an empty function so that if zdc_program_execStr ever needs to
+        // parse the string into code (from the 'x' command) there's somewhere
+        // to store the bytecode.
+        xc_program_add_fn();
  dup:
         res.t = XC_RESULT_STR;
         res.d.id.idx = idx;