96 lines
2.8 KiB
Diff
96 lines
2.8 KiB
Diff
From e724bd66a099d0d866edfab6c5418c2826854d79 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebastian@centricular.com>
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Date: Mon, 30 Sep 2024 18:36:19 +0300
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Subject: [PATCH 09/10] ssaparse: Don't use strstr() on strings that are
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potentially not NULL-terminated
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Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8099>
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---
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.../gst/subparse/gstssaparse.c | 36 ++++++++++++++++++-
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subprojects/gst-plugins-base/meson.build | 1 +
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2 files changed, 36 insertions(+), 1 deletion(-)
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diff --git a/subprojects/gst-plugins-base/gst/subparse/gstssaparse.c b/subprojects/gst-plugins-base/gst/subparse/gstssaparse.c
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index 8ed0134102..2d8daf77e1 100644
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--- a/subprojects/gst-plugins-base/gst/subparse/gstssaparse.c
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+++ b/subprojects/gst-plugins-base/gst/subparse/gstssaparse.c
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@@ -146,6 +146,35 @@ gst_ssa_parse_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
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return res;
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}
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+#ifndef HAVE_MEMMEM
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+// memmem() is a GNU extension so if it's not available we'll need
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+// our own implementation here. Thanks C.
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+static void *
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+my_memmem (const void *haystack, size_t haystacklen, const void *needle,
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+ size_t needlelen)
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+{
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+ const guint8 *cur, *end;
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+
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+ if (needlelen > haystacklen)
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+ return NULL;
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+ if (needlelen == 0)
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+ return (void *) haystack;
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+
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+
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+ cur = haystack;
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+ end = cur + haystacklen - needlelen;
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+
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+ for (; cur <= end; cur++) {
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+ if (memcmp (cur, needle, needlelen) == 0)
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+ return (void *) cur;
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+ }
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+
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+ return NULL;
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+}
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+#else
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+#define my_memmem memmem
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+#endif
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+
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static gboolean
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gst_ssa_parse_setcaps (GstPad * sinkpad, GstCaps * caps)
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{
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@@ -154,6 +183,7 @@ gst_ssa_parse_setcaps (GstPad * sinkpad, GstCaps * caps)
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const GValue *val;
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GstStructure *s;
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const guchar bom_utf8[] = { 0xEF, 0xBB, 0xBF };
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+ const guint8 header[] = "[Script Info]";
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const gchar *end;
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GstBuffer *priv;
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GstMapInfo map;
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@@ -193,7 +223,7 @@ gst_ssa_parse_setcaps (GstPad * sinkpad, GstCaps * caps)
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left -= 3;
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}
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- if (!strstr (ptr, "[Script Info]"))
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+ if (!my_memmem (ptr, left, header, sizeof (header) - 1))
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goto invalid_init;
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if (!g_utf8_validate (ptr, left, &end)) {
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@@ -231,6 +261,10 @@ invalid_init:
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}
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}
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+#ifdef my_memmem
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+#undef my_memmem
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+#endif
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+
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static gboolean
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gst_ssa_parse_remove_override_codes (GstSsaParse * parse, gchar * txt)
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{
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diff --git a/subprojects/gst-plugins-base/meson.build b/subprojects/gst-plugins-base/meson.build
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index 194de8c231..486833bd9f 100644
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--- a/subprojects/gst-plugins-base/meson.build
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+++ b/subprojects/gst-plugins-base/meson.build
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@@ -199,6 +199,7 @@ check_functions = [
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['HAVE_LRINTF', 'lrintf', '#include<math.h>'],
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['HAVE_MMAP', 'mmap', '#include<sys/mman.h>'],
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['HAVE_LOG2', 'log2', '#include<math.h>'],
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+ ['HAVE_MEMMEM', 'memmem', '#include<string.h>'],
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]
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libm = cc.find_library('m', required : false)
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--
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2.47.0
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