[gdb] Fix segfault during inferior call to ifunc

With a simple test-case:
...
$ cat test.c
char *p = "a";
int main (void) {
  return strlen (p);
}
$ gcc -g test.c
...
we run into this segfault:
...
$ gdb -q -batch a.out -ex start -ex "p strlen (p)"
Temporary breakpoint 1 at 0x1151: file test.c, line 4.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Temporary breakpoint 1, main () at test.c:4
4	  return strlen (p);

Fatal signal: Segmentation fault
...

The strlen is an ifunc, and consequently during the call to
call_function_by_hand_dummy for "p strlen (p)" another call
to call_function_by_hand_dummy is used to resolve the ifunc.

This invalidates the get_current_frame () result in the outer call.

Fix this by using prepare_reinflate and reinflate.

Note that this series (
https://inbox.sourceware.org/gdb-patches/20221214033441.499512-1-simon.marchi@polymtl.ca/ )
should address this problem, but this patch is a simpler fix which is easy to
backport.

Tested on x86_64-linux.

Co-Authored-By: Tom de Vries <tdevries@suse.de>
PR gdb/29941
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29941

0 files changed, 0 insertions, 0 deletions