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From afbf725e7380dfb3ff43a993e43abd9759a66c2b Mon Sep 17 00:00:00 2001
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From: Remi Collet <remi@php.net>
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Date: Sat, 13 Dec 2014 09:03:44 +0100
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Subject: [PATCH] Fix bug #68601 buffer read overflow in gd_gif_in.c
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---
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NEWS | 3 +++
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ext/gd/libgd/gd_gif_in.c | 11 +++++++++--
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2 files changed, 12 insertions(+), 2 deletions(-)
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diff --git a/ext/gd/libgd/gd_gif_in.c b/ext/gd/libgd/gd_gif_in.c
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index ee88a2f..491e942 100644
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--- a/ext/gd/libgd/gd_gif_in.c
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+++ b/ext/gd/libgd/gd_gif_in.c
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@@ -72,8 +72,10 @@ static struct {
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#define STACK_SIZE ((1<<(MAX_LWZ_BITS))*2)
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+#define CSD_BUF_SIZE 280
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+
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typedef struct {
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- unsigned char buf[280];
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+ unsigned char buf[CSD_BUF_SIZE];
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int curbit, lastbit, done, last_byte;
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} CODE_STATIC_DATA;
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@@ -400,7 +402,12 @@ GetCode_(gdIOCtx *fd, CODE_STATIC_DATA *scd, int code_size, int flag, int *ZeroD
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ret = 0;
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for (i = scd->curbit, j = 0; j < code_size; ++i, ++j)
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- ret |= ((scd->buf[ i / 8 ] & (1 << (i % 8))) != 0) << j;
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+ if (i < CSD_BUF_SIZE * 8) {
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+ ret |= ((scd->buf[i / 8] & (1 << (i % 8))) != 0) << j;
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+ } else {
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+ ret = -1;
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+ break;
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+ }
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scd->curbit += code_size;
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return ret;
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--
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2.1.4
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From bd31cb756399101234258c5491443531099957c3 Mon Sep 17 00:00:00 2001
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From: Remi Collet <remi@php.net>
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Date: Wed, 17 Dec 2014 10:59:36 +0100
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Subject: [PATCH] Better fix for #68601 for perf
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https://bitbucket.org/libgd/gd-libgd/commits/81e9a993f2893d651d225646378e3fd1b7465467
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---
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ext/gd/libgd/gd_gif_in.c | 12 ++++++------
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1 file changed, 6 insertions(+), 6 deletions(-)
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diff --git a/ext/gd/libgd/gd_gif_in.c b/ext/gd/libgd/gd_gif_in.c
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index 491e942..f41ec84 100644
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--- a/ext/gd/libgd/gd_gif_in.c
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+++ b/ext/gd/libgd/gd_gif_in.c
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@@ -400,14 +400,14 @@ GetCode_(gdIOCtx *fd, CODE_STATIC_DATA *scd, int code_size, int flag, int *ZeroD
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scd->lastbit = (2+count)*8 ;
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}
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- ret = 0;
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- for (i = scd->curbit, j = 0; j < code_size; ++i, ++j)
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- if (i < CSD_BUF_SIZE * 8) {
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+ if ((scd->curbit + code_size - 1) >= (CSD_BUF_SIZE * 8)) {
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+ ret = -1;
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+ } else {
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+ ret = 0;
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+ for (i = scd->curbit, j = 0; j < code_size; ++i, ++j) {
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ret |= ((scd->buf[i / 8] & (1 << (i % 8))) != 0) << j;
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- } else {
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- ret = -1;
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- break;
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}
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+ }
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scd->curbit += code_size;
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return ret;
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--
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2.1.4
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