mirror of
https://git.in.rschanz.org/ryan77627/guix.git
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66 lines
2.4 KiB
Diff
66 lines
2.4 KiB
Diff
Fix CVE-2016-6214 (read out-of-bounds when parsing TGA files).
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https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6214
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Adapted from upstream commit:
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https://github.com/libgd/libgd/commit/341aa68843ceceae9ba6e083431f14a07bd92308
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Since `patch` cannot apply Git binary diffs, we omit the addition of
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'tests/tga/bug00247a.c' and its associated binary data.
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From 341aa68843ceceae9ba6e083431f14a07bd92308 Mon Sep 17 00:00:00 2001
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From: "Christoph M. Becker" <cmbecker69@gmx.de>
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Date: Tue, 12 Jul 2016 19:23:13 +0200
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Subject: [PATCH] Unsupported TGA bpp/alphabit combinations should error
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gracefully
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Currently, only 24bpp without alphabits and 32bpp with 8 alphabits are
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really supported. All other combinations will be rejected with a warning.
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(cherry picked from commit cb1a0b7e54e9aa118270c23a4a6fe560e4590dc9)
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---
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src/gd_tga.c | 16 ++++++----------
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tests/tga/.gitignore | 1 +
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tests/tga/CMakeLists.txt | 1 +
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tests/tga/Makemodule.am | 4 +++-
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tests/tga/bug00247a.c | 19 +++++++++++++++++++
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tests/tga/bug00247a.tga | Bin 0 -> 36 bytes
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6 files changed, 30 insertions(+), 11 deletions(-)
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create mode 100644 tests/tga/bug00247a.c
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create mode 100644 tests/tga/bug00247a.tga
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diff --git a/src/gd_tga.c b/src/gd_tga.c
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index 20fe2d2..b4f8fa6 100644
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--- a/src/gd_tga.c
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+++ b/src/gd_tga.c
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@@ -99,7 +99,7 @@ BGD_DECLARE(gdImagePtr) gdImageCreateFromTgaCtx(gdIOCtx* ctx)
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if (tga->bits == TGA_BPP_24) {
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*tpix = gdTrueColor(tga->bitmap[bitmap_caret + 2], tga->bitmap[bitmap_caret + 1], tga->bitmap[bitmap_caret]);
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bitmap_caret += 3;
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- } else if (tga->bits == TGA_BPP_32 || tga->alphabits) {
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+ } else if (tga->bits == TGA_BPP_32 && tga->alphabits) {
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register int a = tga->bitmap[bitmap_caret + 3];
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*tpix = gdTrueColorAlpha(tga->bitmap[bitmap_caret + 2], tga->bitmap[bitmap_caret + 1], tga->bitmap[bitmap_caret], gdAlphaMax - (a >> 1));
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@@ -159,16 +159,12 @@ int read_header_tga(gdIOCtx *ctx, oTga *tga)
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printf("wxh: %i %i\n", tga->width, tga->height);
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#endif
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- switch(tga->bits) {
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- case 8:
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- case 16:
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- case 24:
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- case 32:
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- break;
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- default:
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- gd_error("bps %i not supported", tga->bits);
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+ if (!((tga->bits == TGA_BPP_24 && tga->alphabits == 0)
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+ || (tga->bits == TGA_BPP_32 && tga->alphabits == 8)))
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+ {
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+ gd_error_ex(GD_WARNING, "gd-tga: %u bits per pixel with %u alpha bits not supported\n",
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+ tga->bits, tga->alphabits);
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return -1;
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- break;
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}
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tga->ident = NULL;
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