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new 5db50e8775 avcodec/ffv1enc: refine end condition
5db50e8775 is described below
commit 5db50e87750ebff1e463771d3a886d7cea0f9708
Author: Michael Niedermayer <[email protected]>
AuthorDate: Tue Dec 23 18:26:41 2025 +0100
Commit: Michael Niedermayer <[email protected]>
CommitDate: Thu Feb 5 16:07:13 2026 +0100
avcodec/ffv1enc: refine end condition
In the case where the last sorted value was -1u and we where on the first
pass of run1 we failed to fill the last few values of bitmap
No real world testcase is known
Fixes: use of uninitialized memory
Fixes:
460333808/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FFV1_fuzzer-6370167888347136
Found-by: continuous fuzzing process
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <[email protected]>
---
libavcodec/ffv1enc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/libavcodec/ffv1enc.c b/libavcodec/ffv1enc.c
index 5daa3aa0cd..623bd2a3ea 100644
--- a/libavcodec/ffv1enc.c
+++ b/libavcodec/ffv1enc.c
@@ -435,7 +435,7 @@ static void set_micro_version(FFV1Context *f)
if (f->version == 3) {
f->micro_version = 4;
} else if (f->version == 4) {
- f->micro_version = 8;
+ f->micro_version = 9;
} else
av_assert0(0);
@@ -1312,7 +1312,7 @@ static int encode_float32_remap_segment(FFV1SliceContext
*sc,
int current_mul = current_mul_index < 0 ? 1 :
FFABS(mul[current_mul_index]);
int64_t val;
if (i == pixel_num) {
- if (last_val == 0xFFFFFFFF) {
+ if (last_val == 0xFFFFFFFF && (!run || run1final)) {
break;
} else {
val = last_val + ((1LL<<32) - last_val + current_mul - 1) /
current_mul * current_mul;
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