Fix incorrectly skipping over the upX_weights
if the cw_mask is present and it is not a multiple of 4.
---
libavformat/jpegxl_probe.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/libavformat/jpegxl_probe.c b/libavformat/jpegxl_probe.c
index 9cd00da194..c03dc3bd1d 100644
--- a/libavformat/jpegxl_probe.c
+++ b/libavformat/jpegxl_probe.c
@@ -368,15 +368,19 @@ int ff_jpegxl_verify_codestream_header(const uint8_t
*buf, int buflen)
/* default transform */
if (!jxl_bits(1)) {
+ uint32_t cw_mask;
+
/* opsin inverse matrix */
if (xyb_encoded && !jxl_bits(1))
jxl_bits_skip(16 * 16);
+
/* cw_mask and default weights */
- if (jxl_bits(1))
+ cw_mask = jxl_bits(3);
+ if (cw_mask & 1)
jxl_bits_skip(16 * 15);
- if (jxl_bits(1))
+ if (cw_mask & 2)
jxl_bits_skip(16 * 55);
- if (jxl_bits(1))
+ if (cw_mask & 4)
jxl_bits_skip(16 * 210);
}
--
2.36.0
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