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authorTom de Vries <tdevries@suse.de>2019-05-21 16:32:41 +0200
committerTom de Vries <tdevries@suse.de>2019-05-21 16:32:41 +0200
commitfb7806c7a49d6eb75cdbff183d10d00f75968c0f (patch)
tree60137fcb017373136def38a45563664f544ca283 /gdb/cli/cli-cmds.c
parent669d0468399d8375f4d25289938a0c06d12e7f2e (diff)
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[gdb/cli] Fix use of uninitialized variable in complete_command
When building gdb on ubuntu 16.04 with gcc 5.4.0, and running the gdb testsuite we run into: ... FAIL: gdb.linespec/explicit.exp: complete after -line: \ cmd complete "b -line argument " (timeout) ... The failure is reproducible outside the testsuite like this: ... $ gdb -q build/gdb/testsuite/outputs/gdb.linespec/explicit/explicit \ -ex "complete b -line argument" Reading symbols from \ build/gdb/testsuite/outputs/gdb.linespec/explicit/explicit... terminate called after throwing an instance of 'std::length_error' what(): basic_string::_M_create Aborted (core dumped) ... The problem is here in complete_command: ... completion_result result = complete (arg, &word, &quote_char); std::string arg_prefix (arg, word - arg); if (result.number_matches != 0) ... The problem is that the word variable is not initialized when result.number_matches == 0, but the variable is still used in the arg_prefix initialization. Fix this by guarding the arg_prefix initialization with the 'result.number_matches != 0' test. Build and tested on x86_64-linux. gdb/ChangeLog: 2019-05-21 Tom de Vries <tdevries@suse.de> PR cli/24587 * cli/cli-cmds.c (complete_command): Fix use of unitialized variable.
Diffstat (limited to 'gdb/cli/cli-cmds.c')
-rw-r--r--gdb/cli/cli-cmds.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/gdb/cli/cli-cmds.c b/gdb/cli/cli-cmds.c
index 332078b..daf409a 100644
--- a/gdb/cli/cli-cmds.c
+++ b/gdb/cli/cli-cmds.c
@@ -248,10 +248,10 @@ complete_command (const char *arg, int from_tty)
completion_result result = complete (arg, &word, &quote_char);
- std::string arg_prefix (arg, word - arg);
-
if (result.number_matches != 0)
{
+ std::string arg_prefix (arg, word - arg);
+
if (result.number_matches == 1)
printf_unfiltered ("%s%s\n", arg_prefix.c_str (), result.match_list[0]);
else