import graphics/ffmpeg

1 files changed, 24 insertions, 0 deletions

diff --git a/graphics/ffmpeg/patches/patch-libavformat_utils_c b/graphics/ffmpeg/patches/patch-libavformat_utils_c
new file mode 100644
index 0000000..fa0c918
--- /dev/null
+++ b/graphics/ffmpeg/patches/patch-libavformat_utils_c
@@ -0,0 +1,24 @@
+llvm 16 optimizations lead to a segfault when seeking in opus files because
+checks that could leave pos_max uninitialized are optimized away, leading
+to out-of-bounds reads from the guard pages.
+
+av_uninit() is complete batshittery:
+
+https://marc.info/?l=openbsd-ports&m=170284868209618&w=2
+
+Turns out the same commit has landed upstream:
+
+https://github.com/FFmpeg/FFmpeg/commit/ab792634197e364ca1bb194f9abe36836e42f12d
+
+Index: libavformat/utils.c
+--- libavformat/utils.c.orig
++++ libavformat/utils.c
+@@ -2146,7 +2146,7 @@ int ff_seek_frame_binary(AVFormatContext *s, int strea
+                          int64_t target_ts, int flags)
+ {
+     const AVInputFormat *avif = s->iformat;
+-    int64_t av_uninit(pos_min), av_uninit(pos_max), pos, pos_limit;
++    int64_t pos_min = 0, pos_max = 0, pos, pos_limit;
+     int64_t ts_min, ts_max, ts;
+     int index;
+     int64_t ret;