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subparse: don't try to index string with -1

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If the len of the string turns out to be 0, str[len - 1] resolved to
str[-1] which is not a good idea.

Fixes: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=46543
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2148>
This commit is contained in:
Matthew Waters 2022-04-10 10:55:02 +10:00 committed by Tim-Philipp Müller
parent e9e4ac0ba9
commit cd577c78f7
1 changed files with 1 additions and 1 deletions
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2
subprojects/gst-plugins-base/gst/subparse/gstsubparseelement.c
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@ -187,7 +187,7 @@ gst_sub_parse_data_format_autodetect (gchar * match_str)
if (sscanf (str, "[%u:%02u.%02u]", &n1, &n2, &n3) == 3 ||
sscanf (str, "[%u:%02u.%03u]", &n1, &n2, &n3) == 3) {
all_lines_good = TRUE;
} else if (str[len - 1] == ']' && strchr (str, ':') != NULL) {
} else if (len > 0 && str[len - 1] == ']' && strchr (str, ':') != NULL) {
all_lines_good = TRUE;
} else {
all_lines_good = FALSE;