NULL + anything is UB.
Signed-off-by: Andreas Rheinhardt <andreas.rheinha...@outlook.com>
---
libavcodec/mimic.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/libavcodec/mimic.c b/libavcodec/mimic.c
index ce5c2afd19..bcf10b7ae1 100644
--- a/libavcodec/mimic.c
+++ b/libavcodec/mimic.c
@@ -268,8 +268,9 @@ static int decode(MimicContext *ctx, int quality, int
num_coeffs,
const int qscale = av_clip(10000 - quality, is_chroma ? 1000 : 2000,
10000) << 2;
const int stride = ctx->frames[ctx->cur_index ].f->linesize[plane];
- const uint8_t *src = ctx->frames[ctx->prev_index].f->data[plane];
uint8_t *dst = ctx->frames[ctx->cur_index ].f->data[plane];
+ /* src is unused for I frames; set to avoid UB pointer arithmetic. */
+ const uint8_t *src = is_iframe ? dst :
ctx->frames[ctx->prev_index].f->data[plane];
for (y = 0; y < ctx->num_vblocks[plane]; y++) {
for (x = 0; x < ctx->num_hblocks[plane]; x++) {
--
2.34.1
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