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| | Fix CVE-2016-6214 (read out-of-bounds when parsing TGA files).
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6214
Adapted from upstream commit:
https://github.com/libgd/libgd/commit/341aa68843ceceae9ba6e083431f14a07bd92308
Since `patch` cannot apply Git binary diffs, we omit the addition of
'tests/tga/bug00247a.c' and its associated binary data.
From 341aa68843ceceae9ba6e083431f14a07bd92308 Mon Sep 17 00:00:00 2001
From: "Christoph M. Becker" <cmbecker69@gmx.de>
Date: Tue, 12 Jul 2016 19:23:13 +0200
Subject: [PATCH] Unsupported TGA bpp/alphabit combinations should error
gracefully
Currently, only 24bpp without alphabits and 32bpp with 8 alphabits are
really supported. All other combinations will be rejected with a warning.
(cherry picked from commit cb1a0b7e54e9aa118270c23a4a6fe560e4590dc9)
---
src/gd_tga.c | 16 ++++++----------
tests/tga/.gitignore | 1 +
tests/tga/CMakeLists.txt | 1 +
tests/tga/Makemodule.am | 4 +++-
tests/tga/bug00247a.c | 19 +++++++++++++++++++
tests/tga/bug00247a.tga | Bin 0 -> 36 bytes
6 files changed, 30 insertions(+), 11 deletions(-)
create mode 100644 tests/tga/bug00247a.c
create mode 100644 tests/tga/bug00247a.tga
diff --git a/src/gd_tga.c b/src/gd_tga.c
index 20fe2d2..b4f8fa6 100644
--- a/src/gd_tga.c
+++ b/src/gd_tga.c
@@ -99,7 +99,7 @@ BGD_DECLARE(gdImagePtr) gdImageCreateFromTgaCtx(gdIOCtx* ctx)
if (tga->bits == TGA_BPP_24) {
*tpix = gdTrueColor(tga->bitmap[bitmap_caret + 2], tga->bitmap[bitmap_caret + 1], tga->bitmap[bitmap_caret]);
bitmap_caret += 3;
- } else if (tga->bits == TGA_BPP_32 || tga->alphabits) {
+ } else if (tga->bits == TGA_BPP_32 && tga->alphabits) {
register int a = tga->bitmap[bitmap_caret + 3];
*tpix = gdTrueColorAlpha(tga->bitmap[bitmap_caret + 2], tga->bitmap[bitmap_caret + 1], tga->bitmap[bitmap_caret], gdAlphaMax - (a >> 1));
@@ -159,16 +159,12 @@ int read_header_tga(gdIOCtx *ctx, oTga *tga)
printf("wxh: %i %i\n", tga->width, tga->height);
#endif
- switch(tga->bits) {
- case 8:
- case 16:
- case 24:
- case 32:
- break;
- default:
- gd_error("bps %i not supported", tga->bits);
+ if (!((tga->bits == TGA_BPP_24 && tga->alphabits == 0)
+ || (tga->bits == TGA_BPP_32 && tga->alphabits == 8)))
+ {
+ gd_error_ex(GD_WARNING, "gd-tga: %u bits per pixel with %u alpha bits not supported\n",
+ tga->bits, tga->alphabits);
return -1;
- break;
}
tga->ident = NULL;
|