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ref: 743d799bfd9014f9ef638634656fea21390d1444
parent: 9d1f28c1e9b8619073b36400e787eff8d84b27c3
author: Robin Watts <[email protected]>
date: Mon Feb 3 06:06:48 EST 2020

jbig2dec: Fix OSS-Fuzz issue 20493

The maximum x gbat works out as 126, where GBW is 32.
This makes right = GBW - gmax huge. Clip the value to
avoid problems.

Thanks for OSS-Fuzz for reporting.

--- a/jbig2_generic.c

+++ b/jbig2_generic.c

@@ -1012,6 +1012,8 @@

         left = -gmin;

     if ((int)right < gmax)

         right = gmax;

+    if (right > GBW)

+        right = GBW;

     right = GBW - right;

     /* So 0 <= x < left or right <= x < GBW needs bounds checking. */