109 lines
3.0 KiB
Diff
109 lines
3.0 KiB
Diff
From 631856a2021d60d29e96d07872c06246eff25a96 Mon Sep 17 00:00:00 2001
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From: Nils Philippsen <nils@redhat.com>
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Date: Fri, 12 Aug 2011 14:44:52 +0200
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Subject: [PATCH] patch: gif-load
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Squashed commit of the following:
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commit 366d6b546e8fb91909550a61abeafc11672667c4
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Author: Nils Philippsen <nils@redhat.com>
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Date: Thu Aug 4 12:51:42 2011 +0200
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file-gif-load: fix heap corruption and buffer overflow (CVE-2011-2896)
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(cherry picked from commit 376ad788c1a1c31d40f18494889c383f6909ebfc)
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commit 3c5864851ea5fe8f89d273ee8ac4df0c1101b315
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Author: Nils Philippsen <nils@redhat.com>
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Date: Thu Aug 4 12:47:44 2011 +0200
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file-gif-load: ensure return value of LZWReadByte() is <= 255
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(cherry picked from commit b1a3de761362db982c0ddfaff60ab4a3c4267f32)
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---
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plug-ins/common/file-gif-load.c | 25 ++++++++++++++-----------
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1 files changed, 14 insertions(+), 11 deletions(-)
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diff --git a/plug-ins/common/file-gif-load.c b/plug-ins/common/file-gif-load.c
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index 9a0720b..8460ec0 100644
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--- a/plug-ins/common/file-gif-load.c
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+++ b/plug-ins/common/file-gif-load.c
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@@ -697,7 +697,8 @@ LZWReadByte (FILE *fd,
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static gint firstcode, oldcode;
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static gint clear_code, end_code;
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static gint table[2][(1 << MAX_LZW_BITS)];
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- static gint stack[(1 << (MAX_LZW_BITS)) * 2], *sp;
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+#define STACK_SIZE ((1 << (MAX_LZW_BITS)) * 2)
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+ static gint stack[STACK_SIZE], *sp;
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gint i;
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if (just_reset_LZW)
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@@ -743,11 +744,11 @@ LZWReadByte (FILE *fd,
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}
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while (firstcode == clear_code);
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- return firstcode;
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+ return firstcode & 255;
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}
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if (sp > stack)
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- return *--sp;
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+ return (*--sp) & 255;
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while ((code = GetCode (fd, code_size, FALSE)) >= 0)
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{
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@@ -770,9 +771,9 @@ LZWReadByte (FILE *fd,
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sp = stack;
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firstcode = oldcode = GetCode (fd, code_size, FALSE);
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- return firstcode;
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+ return firstcode & 255;
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}
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- else if (code == end_code)
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+ else if (code == end_code || code > max_code)
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{
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gint count;
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guchar buf[260];
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@@ -791,13 +792,14 @@ LZWReadByte (FILE *fd,
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incode = code;
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- if (code >= max_code)
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+ if (code == max_code)
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{
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- *sp++ = firstcode;
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+ if (sp < &(stack[STACK_SIZE]))
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+ *sp++ = firstcode;
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code = oldcode;
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}
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- while (code >= clear_code)
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+ while (code >= clear_code && sp < &(stack[STACK_SIZE]))
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{
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*sp++ = table[1][code];
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if (code == table[0][code])
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@@ -808,7 +810,8 @@ LZWReadByte (FILE *fd,
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code = table[0][code];
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}
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- *sp++ = firstcode = table[1][code];
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+ if (sp < &(stack[STACK_SIZE]))
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+ *sp++ = firstcode = table[1][code];
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if ((code = max_code) < (1 << MAX_LZW_BITS))
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{
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@@ -826,10 +829,10 @@ LZWReadByte (FILE *fd,
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oldcode = incode;
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if (sp > stack)
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- return *--sp;
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+ return (*--sp) & 255;
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}
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- return code;
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+ return code & 255;
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}
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static gint32
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--
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1.7.6
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