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fix some integer overflows

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This commit is contained in:
Ludwig Nussel 2005-09-12 15:41:05 +00:00
parent 4caa237d5f
commit 40592957b4
1 changed files with 26 additions and 7 deletions
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33
code/renderer/tr_image.c
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@ -901,6 +901,11 @@ static void LoadBMP( const char *name, byte **pic, int *width, int *height )
rows = -rows; rows = -rows;
numPixels = columns * rows; numPixels = columns * rows;
if(!columns || !rows || numPixels > 0x1FFFFFFF) // 4*1FFFFFFF == 0x7FFFFFFC < 0x7FFFFFFF
{
ri.Error (ERR_DROP, "LoadBMP: %s has an invalid image size\n", name);
}
if ( width ) if ( width )
*width = columns; *width = columns;
if ( height ) if ( height )
@ -991,7 +996,7 @@ static void LoadPCX ( const char *filename, byte **pic, byte **palette, int *wid
int len; int len;
int dataByte, runLength; int dataByte, runLength;
byte *out, *pix; byte *out, *pix;
int xmax, ymax; unsigned xmax, ymax;
*pic = NULL; *pic = NULL;
*palette = NULL; *palette = NULL;
@ -1090,6 +1095,7 @@ static void LoadPCX32 ( const char *filename, byte **pic, int *width, int *heigh
return; return;
} }
// LoadPCX32 ensures width, height < 1024
c = (*width) * (*height); c = (*width) * (*height);
pic32 = *pic = ri.Malloc(4 * c ); pic32 = *pic = ri.Malloc(4 * c );
for (i = 0 ; i < c ; i++) { for (i = 0 ; i < c ; i++) {
@ -1120,7 +1126,7 @@ LoadTGA
*/ */
static void LoadTGA ( const char *name, byte **pic, int *width, int *height) static void LoadTGA ( const char *name, byte **pic, int *width, int *height)
{ {
int columns, rows, numPixels; unsigned columns, rows, numPixels;
byte *pixbuf; byte *pixbuf;
int row, column; int row, column;
byte *buf_p; byte *buf_p;
@ -1179,14 +1185,19 @@ static void LoadTGA ( const char *name, byte **pic, int *width, int *height)
columns = targa_header.width; columns = targa_header.width;
rows = targa_header.height; rows = targa_header.height;
numPixels = columns * rows; numPixels = columns * rows * 4;
if (width) if (width)
*width = columns; *width = columns;
if (height) if (height)
*height = rows; *height = rows;
targa_rgba = ri.Malloc (numPixels*4); if(!columns || !rows || numPixels > 0x7FFFFFFF)
{
ri.Error (ERR_DROP, "LoadTGA: %s has an invalid image size\n", name);
}
targa_rgba = ri.Malloc (numPixels);
*pic = targa_rgba; *pic = targa_rgba;
if (targa_header.id_length != 0) if (targa_header.id_length != 0)
@ -1361,7 +1372,7 @@ static void LoadJPG( const char *filename, unsigned char **pic, int *width, int
/* This struct contains the JPEG decompression parameters and pointers to /* This struct contains the JPEG decompression parameters and pointers to
* working space (which is allocated as needed by the JPEG library). * working space (which is allocated as needed by the JPEG library).
*/ */
struct jpeg_decompress_struct cinfo; struct jpeg_decompress_struct cinfo = {0};
/* We use our private extension JPEG error handler. /* We use our private extension JPEG error handler.
* Note that this struct must live as long as the main JPEG parameter * Note that this struct must live as long as the main JPEG parameter
* struct, to avoid dangling-pointer problems. * struct, to avoid dangling-pointer problems.
@ -1377,8 +1388,8 @@ static void LoadJPG( const char *filename, unsigned char **pic, int *width, int
struct jpeg_error_mgr jerr; struct jpeg_error_mgr jerr;
/* More stuff */ /* More stuff */
JSAMPARRAY buffer; /* Output row buffer */ JSAMPARRAY buffer; /* Output row buffer */
int row_stride; /* physical row width in output buffer */ unsigned row_stride; /* physical row width in output buffer */
int pixelcount; unsigned pixelcount;
unsigned char *out, *out_converted; unsigned char *out, *out_converted;
byte *fbuffer; byte *fbuffer;
byte *bbuf; byte *bbuf;
@ -1442,6 +1453,14 @@ static void LoadJPG( const char *filename, unsigned char **pic, int *width, int
pixelcount = cinfo.output_width * cinfo.output_height; pixelcount = cinfo.output_width * cinfo.output_height;
row_stride = cinfo.output_width * cinfo.output_components; row_stride = cinfo.output_width * cinfo.output_components;
if(!cinfo.output_width || !cinfo.output_height
|| pixelcount > 0x1FFFFFFF || cinfo.output_components > 4) // 4*1FFFFFFF == 0x7FFFFFFC < 0x7FFFFFFF
{
ri.Error (ERR_DROP, "LoadJPG: %s has an invalid image size\n", filename);
}
out = ri.Malloc(pixelcount * 4); out = ri.Malloc(pixelcount * 4);
*width = cinfo.output_width; *width = cinfo.output_width;