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-rw-r--r--user/libgd/CVE-2018-5711.patch61
1 files changed, 61 insertions, 0 deletions
diff --git a/user/libgd/CVE-2018-5711.patch b/user/libgd/CVE-2018-5711.patch
new file mode 100644
index 000000000..dff2b9ea2
--- /dev/null
+++ b/user/libgd/CVE-2018-5711.patch
@@ -0,0 +1,61 @@
+From a11f47475e6443b7f32d21f2271f28f417e2ac04 Mon Sep 17 00:00:00 2001
+From: "Christoph M. Becker" <cmbecker69@gmx.de>
+Date: Wed, 29 Nov 2017 19:37:38 +0100
+Subject: [PATCH] Fix #420: Potential infinite loop in gdImageCreateFromGifCtx
+
+Due to a signedness confusion in `GetCode_` a corrupt GIF file can
+trigger an infinite loop. Furthermore we make sure that a GIF without
+any palette entries is treated as invalid *after* open palette entries
+have been removed.
+
+CVE-2018-5711
+
+See also https://bugs.php.net/bug.php?id=75571.
+---
+ src/gd_gif_in.c | 12 ++++++------
+ tests/gif/.gitignore | 1 +
+ tests/gif/CMakeLists.txt | 1 +
+ tests/gif/Makemodule.am | 2 ++
+ tests/gif/php_bug_75571.c | 28 ++++++++++++++++++++++++++++
+ tests/gif/php_bug_75571.gif | Bin 0 -> 1731 bytes
+ 6 files changed, 38 insertions(+), 6 deletions(-)
+ create mode 100644 tests/gif/php_bug_75571.c
+ create mode 100644 tests/gif/php_bug_75571.gif
+
+diff --git a/src/gd_gif_in.c b/src/gd_gif_in.c
+index daf26e79..0a8bd717 100644
+--- a/src/gd_gif_in.c
++++ b/src/gd_gif_in.c
+@@ -335,11 +335,6 @@ BGD_DECLARE(gdImagePtr) gdImageCreateFromGifCtx(gdIOCtxPtr fd)
+ return 0;
+ }
+
+- if(!im->colorsTotal) {
+- gdImageDestroy(im);
+- return 0;
+- }
+-
+ /* Check for open colors at the end, so
+ * we can reduce colorsTotal and ultimately
+ * BitsPerPixel */
+@@ -351,6 +346,11 @@ BGD_DECLARE(gdImagePtr) gdImageCreateFromGifCtx(gdIOCtxPtr fd)
+ }
+ }
+
++ if(!im->colorsTotal) {
++ gdImageDestroy(im);
++ return 0;
++ }
++
+ return im;
+ }
+
+@@ -447,7 +447,7 @@ static int
+ GetCode_(gdIOCtx *fd, CODE_STATIC_DATA *scd, int code_size, int flag, int *ZeroDataBlockP)
+ {
+ int i, j, ret;
+- unsigned char count;
++ int count;
+
+ if(flag) {
+ scd->curbit = 0;