diff options
Diffstat (limited to 'user/libgd/CVE-2019-6978.patch')
| -rw-r--r-- | user/libgd/CVE-2019-6978.patch | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/user/libgd/CVE-2019-6978.patch b/user/libgd/CVE-2019-6978.patch new file mode 100644 index 000000000..0cfdda919 --- /dev/null +++ b/user/libgd/CVE-2019-6978.patch @@ -0,0 +1,216 @@ +From 553702980ae89c83f2d6e254d62cf82e204956d0 Mon Sep 17 00:00:00 2001 +From: "Christoph M. Becker" <cmbecker69@gmx.de> +Date: Thu, 17 Jan 2019 11:54:55 +0100 +Subject: [PATCH] Fix #492: Potential double-free in gdImage*Ptr() + +Whenever `gdImage*Ptr()` calls `gdImage*Ctx()` and the latter fails, we +must not call `gdDPExtractData()`; otherwise a double-free would +happen. Since `gdImage*Ctx()` are void functions, and we can't change +that for BC reasons, we're introducing static helpers which are used +internally. + +We're adding a regression test for `gdImageJpegPtr()`, but not for +`gdImageGifPtr()` and `gdImageWbmpPtr()` since we don't know how to +trigger failure of the respective `gdImage*Ctx()` calls. + +This potential security issue has been reported by Solmaz Salimi (aka. +Rooney). +--- + src/gd_gif_out.c | 18 +++++++++++++++--- + src/gd_jpeg.c | 20 ++++++++++++++++---- + src/gd_wbmp.c | 21 ++++++++++++++++++--- + tests/jpeg/.gitignore | 1 + + tests/jpeg/CMakeLists.txt | 1 + + tests/jpeg/Makemodule.am | 3 ++- + tests/jpeg/jpeg_ptr_double_free.c | 31 +++++++++++++++++++++++++++++++ + 7 files changed, 84 insertions(+), 11 deletions(-) + create mode 100644 tests/jpeg/jpeg_ptr_double_free.c + +diff --git a/src/gd_gif_out.c b/src/gd_gif_out.c +index 298a5812..d5a95346 100644 +--- a/src/gd_gif_out.c ++++ b/src/gd_gif_out.c +@@ -99,6 +99,7 @@ static void char_init(GifCtx *ctx); + static void char_out(int c, GifCtx *ctx); + static void flush_char(GifCtx *ctx); + ++static int _gdImageGifCtx(gdImagePtr im, gdIOCtxPtr out); + + + +@@ -131,8 +132,11 @@ BGD_DECLARE(void *) gdImageGifPtr(gdImagePtr im, int *size) + void *rv; + gdIOCtx *out = gdNewDynamicCtx(2048, NULL); + if (out == NULL) return NULL; +- gdImageGifCtx(im, out); +- rv = gdDPExtractData(out, size); ++ if (!_gdImageGifCtx(im, out)) { ++ rv = gdDPExtractData(out, size); ++ } else { ++ rv = NULL; ++ } + out->gd_free(out); + return rv; + } +@@ -220,6 +224,12 @@ BGD_DECLARE(void) gdImageGif(gdImagePtr im, FILE *outFile) + + */ + BGD_DECLARE(void) gdImageGifCtx(gdImagePtr im, gdIOCtxPtr out) ++{ ++ _gdImageGifCtx(im, out); ++} ++ ++/* returns 0 on success, 1 on failure */ ++static int _gdImageGifCtx(gdImagePtr im, gdIOCtxPtr out) + { + gdImagePtr pim = 0, tim = im; + int interlace, BitsPerPixel; +@@ -231,7 +241,7 @@ BGD_DECLARE(void) gdImageGifCtx(gdImagePtr im, gdIOCtxPtr out) + based temporary image. */ + pim = gdImageCreatePaletteFromTrueColor(im, 1, 256); + if(!pim) { +- return; ++ return 1; + } + tim = pim; + } +@@ -247,6 +257,8 @@ BGD_DECLARE(void) gdImageGifCtx(gdImagePtr im, gdIOCtxPtr out) + /* Destroy palette based temporary image. */ + gdImageDestroy( pim); + } ++ ++ return 0; + } + + +diff --git a/src/gd_jpeg.c b/src/gd_jpeg.c +index fc058420..96ef4302 100644 +--- a/src/gd_jpeg.c ++++ b/src/gd_jpeg.c +@@ -123,6 +123,8 @@ static void fatal_jpeg_error(j_common_ptr cinfo) + exit(99); + } + ++static int _gdImageJpegCtx(gdImagePtr im, gdIOCtx *outfile, int quality); ++ + /* + * Write IM to OUTFILE as a JFIF-formatted JPEG image, using quality + * QUALITY. If QUALITY is in the range 0-100, increasing values +@@ -237,8 +239,11 @@ BGD_DECLARE(void *) gdImageJpegPtr(gdImagePtr im, int *size, int quality) + void *rv; + gdIOCtx *out = gdNewDynamicCtx(2048, NULL); + if (out == NULL) return NULL; +- gdImageJpegCtx(im, out, quality); +- rv = gdDPExtractData(out, size); ++ if (!_gdImageJpegCtx(im, out, quality)) { ++ rv = gdDPExtractData(out, size); ++ } else { ++ rv = NULL; ++ } + out->gd_free(out); + return rv; + } +@@ -259,6 +264,12 @@ void jpeg_gdIOCtx_dest(j_compress_ptr cinfo, gdIOCtx *outfile); + + */ + BGD_DECLARE(void) gdImageJpegCtx(gdImagePtr im, gdIOCtx *outfile, int quality) ++{ ++ _gdImageJpegCtx(im, outfile, quality); ++} ++ ++/* returns 0 on success, 1 on failure */ ++static int _gdImageJpegCtx(gdImagePtr im, gdIOCtx *outfile, int quality) + { + struct jpeg_compress_struct cinfo; + struct jpeg_error_mgr jerr; +@@ -293,7 +304,7 @@ BGD_DECLARE(void) gdImageJpegCtx(gdImagePtr im, gdIOCtx *outfile, int quality) + if(row) { + gdFree(row); + } +- return; ++ return 1; + } + + cinfo.err->emit_message = jpeg_emit_message; +@@ -334,7 +345,7 @@ BGD_DECLARE(void) gdImageJpegCtx(gdImagePtr im, gdIOCtx *outfile, int quality) + if(row == 0) { + gd_error("gd-jpeg: error: unable to allocate JPEG row structure: gdCalloc returns NULL\n"); + jpeg_destroy_compress(&cinfo); +- return; ++ return 1; + } + + rowptr[0] = row; +@@ -411,6 +424,7 @@ BGD_DECLARE(void) gdImageJpegCtx(gdImagePtr im, gdIOCtx *outfile, int quality) + jpeg_finish_compress(&cinfo); + jpeg_destroy_compress(&cinfo); + gdFree(row); ++ return 0; + } + + +diff --git a/src/gd_wbmp.c b/src/gd_wbmp.c +index f19a1c96..a49bdbec 100644 +--- a/src/gd_wbmp.c ++++ b/src/gd_wbmp.c +@@ -88,6 +88,8 @@ int gd_getin(void *in) + return (gdGetC((gdIOCtx *)in)); + } + ++static int _gdImageWBMPCtx(gdImagePtr image, int fg, gdIOCtx *out); ++ + /* + Function: gdImageWBMPCtx + +@@ -100,6 +102,12 @@ int gd_getin(void *in) + out - the stream where to write + */ + BGD_DECLARE(void) gdImageWBMPCtx(gdImagePtr image, int fg, gdIOCtx *out) ++{ ++ _gdImageWBMPCtx(image, fg, out); ++} ++ ++/* returns 0 on success, 1 on failure */ ++static int _gdImageWBMPCtx(gdImagePtr image, int fg, gdIOCtx *out) + { + int x, y, pos; + Wbmp *wbmp; +@@ -107,7 +115,7 @@ BGD_DECLARE(void) gdImageWBMPCtx(gdImagePtr image, int fg, gdIOCtx *out) + /* create the WBMP */ + if((wbmp = createwbmp(gdImageSX(image), gdImageSY(image), WBMP_WHITE)) == NULL) { + gd_error("Could not create WBMP\n"); +- return; ++ return 1; + } + + /* fill up the WBMP structure */ +@@ -123,11 +131,15 @@ BGD_DECLARE(void) gdImageWBMPCtx(gdImagePtr image, int fg, gdIOCtx *out) + + /* write the WBMP to a gd file descriptor */ + if(writewbmp(wbmp, &gd_putout, out)) { ++ freewbmp(wbmp); + gd_error("Could not save WBMP\n"); ++ return 1; + } + + /* des submitted this bugfix: gdFree the memory. */ + freewbmp(wbmp); ++ ++ return 0; + } + + /* +@@ -271,8 +283,11 @@ BGD_DECLARE(void *) gdImageWBMPPtr(gdImagePtr im, int *size, int fg) + void *rv; + gdIOCtx *out = gdNewDynamicCtx(2048, NULL); + if (out == NULL) return NULL; +- gdImageWBMPCtx(im, fg, out); +- rv = gdDPExtractData(out, size); ++ if (!_gdImageWBMPCtx(im, fg, out)) { ++ rv = gdDPExtractData(out, size); ++ } else { ++ rv = NULL; ++ } + out->gd_free(out); + return rv; + } |