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* [binutils-gdb] Fix interpreter-exec crash
@ 2022-08-31 17:15 Tom Tromey
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From: Tom Tromey @ 2022-08-31 17:15 UTC (permalink / raw)
To: gdb-cvs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=058dc2c95935d54caa8891613a1080d57665fc43
commit 058dc2c95935d54caa8891613a1080d57665fc43
Author: Tom Tromey <tromey@adacore.com>
Date: Fri Aug 12 13:15:01 2022 -0600
Fix interpreter-exec crash
PR mi/10347 points out that using interpreter-exec inside of a
"define" command will crash gdb. The bug here is that
gdb_setup_readline doesn't check for the case where instream==nullptr.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=10347
Diff:
---
gdb/event-top.c | 6 ++++--
gdb/testsuite/gdb.base/interp.exp | 11 +++++++++++
2 files changed, 15 insertions(+), 2 deletions(-)
diff --git a/gdb/event-top.c b/gdb/event-top.c
index 1b522a77d79..290c3d87744 100644
--- a/gdb/event-top.c
+++ b/gdb/event-top.c
@@ -1332,8 +1332,10 @@ gdb_setup_readline (int editing)
/* If the input stream is connected to a terminal, turn on editing.
However, that is only allowed on the main UI, as we can only have
- one instance of readline. */
- if (ISATTY (ui->instream) && editing && ui == main_ui)
+ one instance of readline. Also, INSTREAM might be nullptr when
+ executing a user-defined command. */
+ if (ui->instream != nullptr && ISATTY (ui->instream)
+ && editing && ui == main_ui)
{
/* Tell gdb that we will be using the readline library. This
could be overwritten by a command in .gdbinit like 'set
diff --git a/gdb/testsuite/gdb.base/interp.exp b/gdb/testsuite/gdb.base/interp.exp
index f748ffd8050..3db90f64103 100644
--- a/gdb/testsuite/gdb.base/interp.exp
+++ b/gdb/testsuite/gdb.base/interp.exp
@@ -79,6 +79,17 @@ gdb_test_multiple "interpreter-exec mi3 \"-break-insert main\"" "" {
}
}
+set test "define hello command"
+set commands "interpreter-exec mi3 \"-data-evaluate-expression 23\""
+gdb_test_multiple "define hello" "$test" {
+ -re "Type commands for definition of \"hello\".\r\nEnd with a line saying just \"end\".\r\n>$" {
+ pass "$test"
+ }
+}
+gdb_test "$commands\nend" "" "finish defining hello command"
+
+gdb_test "hello" [string_to_regexp "^done,value=\"23\""]
+
if ![runto_main] then {
return -1
}
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