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Avoid unlikely crash when xasprintf returns 0

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Problem caught by GCC 12.
* src/tar.c (easprintf): New static function, which never returns
a null pointer.  All uses of xasprintf replaced by uses of this
function.
This commit is contained in:
Paul Eggert
2022-07-25 09:44:00 -07:00
parent 8ed180b03c
commit fffc6149fd
1 changed files with 24 additions and 9 deletions
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src/tar.c
+24 -9
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@@ -845,10 +845,25 @@ static enum atime_preserve const atime_preserve_types[] =
ARGMATCH_VERIFY (atime_preserve_args, atime_preserve_types); ARGMATCH_VERIFY (atime_preserve_args, atime_preserve_types);
static char * ATTRIBUTE_FORMAT ((printf, 1, 2))
easprintf (char const *format, ...)
{
va_list args;
va_start (args, format);
char *result = xvasprintf (format, args);
int err = errno;
va_end (args);
if (!result)
FATAL_ERROR ((0, err, "vasprintf"));
return result;
}
static char * static char *
format_default_settings (void) format_default_settings (void)
{ {
return xasprintf ( return easprintf (
"--format=%s -f%s -b%d --quoting-style=%s --rmt-command=%s" "--format=%s -f%s -b%d --quoting-style=%s --rmt-command=%s"
#ifdef REMOTE_SHELL #ifdef REMOTE_SHELL
" --rsh-command=%s" " --rsh-command=%s"
@@ -1130,35 +1145,35 @@ tar_help_filter (int key, const char *text, void *input)
break; break;
case 'j': case 'j':
s = xasprintf (_("filter the archive through %s"), BZIP2_PROGRAM); s = easprintf (_("filter the archive through %s"), BZIP2_PROGRAM);
break; break;
case 'z': case 'z':
s = xasprintf (_("filter the archive through %s"), GZIP_PROGRAM); s = easprintf (_("filter the archive through %s"), GZIP_PROGRAM);
break; break;
case 'Z': case 'Z':
s = xasprintf (_("filter the archive through %s"), COMPRESS_PROGRAM); s = easprintf (_("filter the archive through %s"), COMPRESS_PROGRAM);
break; break;
case LZIP_OPTION: case LZIP_OPTION:
s = xasprintf (_("filter the archive through %s"), LZIP_PROGRAM); s = easprintf (_("filter the archive through %s"), LZIP_PROGRAM);
break; break;
case LZMA_OPTION: case LZMA_OPTION:
s = xasprintf (_("filter the archive through %s"), LZMA_PROGRAM); s = easprintf (_("filter the archive through %s"), LZMA_PROGRAM);
break; break;
case LZOP_OPTION: case LZOP_OPTION:
s = xasprintf (_("filter the archive through %s"), LZOP_PROGRAM); s = easprintf (_("filter the archive through %s"), LZOP_PROGRAM);
break; break;
case 'J': case 'J':
s = xasprintf (_("filter the archive through %s"), XZ_PROGRAM); s = easprintf (_("filter the archive through %s"), XZ_PROGRAM);
break; break;
case ZSTD_OPTION: case ZSTD_OPTION:
s = xasprintf (_("filter the archive through %s"), ZSTD_PROGRAM); s = easprintf (_("filter the archive through %s"), ZSTD_PROGRAM);
break; break;
case ARGP_KEY_HELP_EXTRA: case ARGP_KEY_HELP_EXTRA: