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37 lines
1.3 KiB
Diff
37 lines
1.3 KiB
Diff
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Fix CVE-2019-6977:
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https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-6977
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Patch copied from Debian:
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https://salsa.debian.org/debian/libgd2/commit/2d7d3b68bb79843e5271a05543e996fd5a3a8cd1
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Description: Heap-based buffer overflow in gdImageColorMatch
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Origin: other, https://gist.github.com/cmb69/1f36d285eb297ed326f5c821d7aafced
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Bug-PHP: https://bugs.php.net/bug.php?id=77270
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Bug-Debian: https://bugs.debian.org/920645
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Bug-Debian-Security: https://security-tracker.debian.org/tracker/CVE-2019-6977
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Forwarded: no
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Author: "Christoph M. Becker" <cmbecker69@gmx.de>
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Last-Update: 2019-02-01
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At least some of the image reading functions may return images which
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use color indexes greater than or equal to im->colorsTotal. We cater
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to this by always using a buffer size which is sufficient for
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`gdMaxColors` in `gdImageColorMatch()`.
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---
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--- a/src/gd_color_match.c
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+++ b/src/gd_color_match.c
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@@ -31,8 +31,8 @@ BGD_DECLARE(int) gdImageColorMatch (gdIm
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return -4; /* At least 1 color must be allocated */
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}
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- buf = (unsigned long *)gdMalloc(sizeof(unsigned long) * 5 * im2->colorsTotal);
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- memset (buf, 0, sizeof(unsigned long) * 5 * im2->colorsTotal );
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+ buf = (unsigned long *)gdMalloc(sizeof(unsigned long) * 5 * gdMaxColors);
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+ memset (buf, 0, sizeof(unsigned long) * 5 * gdMaxColors );
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for (x=0; x < im1->sx; x++) {
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for( y=0; y<im1->sy; y++ ) {
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