shithub: jbig2

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jbig2dec: Initiate variable before avoids using uninited data during cleanup.

Fixes OSS-fuzz issue 21571.
Also fixes Coverity CID 355467.

Thanks to OSS-fuzz for reporting.

--- a/jbig2_text.c

+++ b/jbig2_text.c

@@ -593,6 +593,9 @@

     uint32_t table_index = 0;

     const Jbig2HuffmanParams *huffman_params = NULL;

+    /* zero params to ease cleanup later */

+    memset(&params, 0, sizeof(Jbig2TextRegionParams));

+

     /* 7.4.1 */

     if (segment->data_length < 17) {

         code = jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number, "segment too short");

@@ -613,9 +616,6 @@

     offset += 2;

     jbig2_error(ctx, JBIG2_SEVERITY_DEBUG, segment->number, "text region header flags 0x%04x", flags);

-

-    /* zero params to ease cleanup later */

-    memset(&params, 0, sizeof(Jbig2TextRegionParams));

     params.SBHUFF = flags & 0x0001;

     params.SBREFINE = flags & 0x0002;