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From ac16bdf2d41724b5a65255d4c28fb0ec46bc42f5 Mon Sep 17 00:00:00 2001
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From: Mike Frysinger <vapier@gentoo.org>
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Date: Sat, 14 Jul 2018 13:54:08 -0400
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Subject: [PATCH] bmp: check return value in gdImageBmpPtr
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Closes #447.
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---
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src/gd_bmp.c | 17 ++++++++++++++---
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1 file changed, 14 insertions(+), 3 deletions(-)
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diff --git a/src/gd_bmp.c b/src/gd_bmp.c
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index bde0b9d3..78f40d9a 100644
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--- a/src/gd_bmp.c
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+++ b/src/gd_bmp.c
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@@ -47,6 +47,8 @@ static int bmp_read_4bit(gdImagePtr im, gdIOCtxPtr infile, bmp_info_t *info, bmp
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static int bmp_read_8bit(gdImagePtr im, gdIOCtxPtr infile, bmp_info_t *info, bmp_hdr_t *header);
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static int bmp_read_rle(gdImagePtr im, gdIOCtxPtr infile, bmp_info_t *info);
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+static int _gdImageBmpCtx(gdImagePtr im, gdIOCtxPtr out, int compression);
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+
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#define BMP_DEBUG(s)
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static int gdBMPPutWord(gdIOCtx *out, int w)
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@@ -87,8 +89,10 @@ BGD_DECLARE(void *) gdImageBmpPtr(gdImagePtr im, int *size, int compression)
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void *rv;
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gdIOCtx *out = gdNewDynamicCtx(2048, NULL);
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if (out == NULL) return NULL;
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- gdImageBmpCtx(im, out, compression);
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- rv = gdDPExtractData(out, size);
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+ if (!_gdImageBmpCtx(im, out, compression))
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+ rv = gdDPExtractData(out, size);
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+ else
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+ rv = NULL;
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out->gd_free(out);
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return rv;
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}
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@@ -141,6 +145,11 @@ BGD_DECLARE(void) gdImageBmp(gdImagePtr im, FILE *outFile, int compression)
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compression - whether to apply RLE or not.
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*/
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BGD_DECLARE(void) gdImageBmpCtx(gdImagePtr im, gdIOCtxPtr out, int compression)
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+{
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+ _gdImageBmpCtx(im, out, compression);
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+}
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+
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+static int _gdImageBmpCtx(gdImagePtr im, gdIOCtxPtr out, int compression)
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{
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int bitmap_size = 0, info_size, total_size, padding;
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int i, row, xpos, pixel;
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@@ -148,6 +157,7 @@ BGD_DECLARE(void) gdImageBmpCtx(gdImagePtr im, gdIOCtxPtr out, int compression)
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unsigned char *uncompressed_row = NULL, *uncompressed_row_start = NULL;
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FILE *tmpfile_for_compression = NULL;
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gdIOCtxPtr out_original = NULL;
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+ int ret = 1;
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/* No compression if its true colour or we don't support seek */
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if (im->trueColor) {
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@@ -325,6 +335,7 @@ BGD_DECLARE(void) gdImageBmpCtx(gdImagePtr im, gdIOCtxPtr out, int compression)
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out_original = NULL;
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}
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+ ret = 0;
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cleanup:
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if (tmpfile_for_compression) {
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#ifdef _WIN32
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@@ -338,7 +349,7 @@ BGD_DECLARE(void) gdImageBmpCtx(gdImagePtr im, gdIOCtxPtr out, int compression)
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if (out_original) {
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out_original->gd_free(out_original);
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}
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- return;
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+ return ret;
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}
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static int compress_row(unsigned char *row, int length)
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