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From 2cd30c2b06ce332dede81cccad8b334cde997281 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Thu, 17 Aug 2017 11:47:40 +0200
Subject: [PATCH] tgatoimage(): avoid excessive memory allocation attempt, and
fixes unaligned load (#995)
---
src/bin/jp2/convert.c | 39 +++++++++++++++++++++++++++------------
1 file changed, 27 insertions(+), 12 deletions(-)
diff --git a/src/bin/jp2/convert.c b/src/bin/jp2/convert.c
index a4eb81f6a..73dfc8d5f 100644
--- a/src/bin/jp2/convert.c
+++ b/src/bin/jp2/convert.c
@@ -580,13 +580,10 @@ struct tga_header {
};
#endif /* INFORMATION_ONLY */
-static unsigned short get_ushort(const unsigned char *data)
+/* Returns a ushort from a little-endian serialized value */
+static unsigned short get_tga_ushort(const unsigned char *data)
{
- unsigned short val = *(const unsigned short *)data;
-#ifdef OPJ_BIG_ENDIAN
- val = ((val & 0xffU) << 8) | (val >> 8);
-#endif
- return val;
+ return data[0] | (data[1] << 8);
}
#define TGA_HEADER_SIZE 18
@@ -613,17 +610,17 @@ static int tga_readheader(FILE *fp, unsigned int *bits_per_pixel,
id_len = tga[0];
/*cmap_type = tga[1];*/
image_type = tga[2];
- /*cmap_index = get_ushort(&tga[3]);*/
- cmap_len = get_ushort(&tga[5]);
+ /*cmap_index = get_tga_ushort(&tga[3]);*/
+ cmap_len = get_tga_ushort(&tga[5]);
cmap_entry_size = tga[7];
#if 0
- x_origin = get_ushort(&tga[8]);
- y_origin = get_ushort(&tga[10]);
+ x_origin = get_tga_ushort(&tga[8]);
+ y_origin = get_tga_ushort(&tga[10]);
#endif
- image_w = get_ushort(&tga[12]);
- image_h = get_ushort(&tga[14]);
+ image_w = get_tga_ushort(&tga[12]);
+ image_h = get_tga_ushort(&tga[14]);
pixel_depth = tga[16];
image_desc = tga[17];
@@ -817,6 +814,24 @@ opj_image_t* tgatoimage(const char *filename, opj_cparameters_t *parameters)
color_space = OPJ_CLRSPC_SRGB;
}
+ /* If the declared file size is > 10 MB, check that the file is big */
+ /* enough to avoid excessive memory allocations */
+ if (image_height != 0 && image_width > 10000000 / image_height / numcomps) {
+ char ch;
+ OPJ_UINT64 expected_file_size =
+ (OPJ_UINT64)image_width * image_height * numcomps;
+ long curpos = ftell(f);
+ if (expected_file_size > (OPJ_UINT64)INT_MAX) {
+ expected_file_size = (OPJ_UINT64)INT_MAX;
+ }
+ fseek(f, (long)expected_file_size - 1, SEEK_SET);
+ if (fread(&ch, 1, 1, f) != 1) {
+ fclose(f);
+ return NULL;
+ }
+ fseek(f, curpos, SEEK_SET);
+ }
+
subsampling_dx = parameters->subsampling_dx;
subsampling_dy = parameters->subsampling_dy;
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