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Git pushed a commit to branch release/4.3
in repository ffmpeg.

commit 6dc71760d27292d34248e179af9681062ae5d5bd
Author:     Michael Niedermayer <[email protected]>
AuthorDate: Tue Aug 5 23:18:47 2025 +0200
Commit:     James Almer <[email protected]>
CommitDate: Fri Jan 2 21:58:51 2026 +0000

    avcodec/jpeg2000dec: move cdef default check into get_siz()
    
    This way cdef is at its final value earlier
    
    Signed-off-by: Michael Niedermayer <[email protected]>
    (cherry picked from commit 104d6846c1be0cb757dc95d5801a416f4d7c687d)
    Signed-off-by: Michael Niedermayer <[email protected]>
    (cherry picked from commit de97cc3892f9655e292af8d7d235f2c1eb77b3b7)
    Signed-off-by: Carlos Henrique Lima Melara <[email protected]>
---
 libavcodec/jpeg2000dec.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index 5f36bc6e35..51fd5dd2dc 100644
--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -340,6 +340,17 @@ static int get_siz(Jpeg2000DecoderContext *s)
         return AVERROR_INVALIDDATA;
     }
 
+    for (i = 0; i < s->ncomponents; i++) {
+        if (s->cdef[i] < 0) {
+            for (i = 0; i < s->ncomponents; i++) {
+                s->cdef[i] = i + 1;
+            }
+            if ((s->ncomponents & 1) == 0)
+                s->cdef[s->ncomponents-1] = 0;
+        }
+    }
+    // after here we no longer have to consider negative cdef
+
     for (i = 0; i < s->ncomponents; i++) { // Ssiz_i XRsiz_i, YRsiz_i
         uint8_t x    = bytestream2_get_byteu(&s->g);
         s->cbps[i]   = (x & 0x7f) + 1;

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