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Fixing various crashes when loading jpg, png and tga images.

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This commit is contained in:
Martins Mozeiko 2015-04-11 15:49:56 -07:00
parent 75f69ce5ed
commit b2d440cfb5
1 changed files with 19 additions and 5 deletions
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24
stb_image.h
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@ -1144,6 +1144,10 @@ stbi_inline static int stbi__at_eof(stbi__context *s)
static void stbi__skip(stbi__context *s, int n)
{
if (n < 0) {
s->img_buffer = s->img_buffer_end;
return;
}
if (s->io.read) {
int blen = (int) (s->img_buffer_end - s->img_buffer);
if (blen < n) {
@ -1552,6 +1556,7 @@ stbi_inline static int stbi__extend_receive(stbi__jpeg *j, int n)
sgn = (stbi__int32)j->code_buffer >> 31; // sign bit is always in MSB
k = stbi_lrot(j->code_buffer, n);
STBI_ASSERT(n >= 0 && n < sizeof(stbi__bmask)/sizeof(*stbi__bmask));
j->code_buffer = k & ~stbi__bmask[n];
k &= stbi__bmask[n];
j->code_bits -= n;
@ -2700,6 +2705,10 @@ static int stbi__decode_jpeg_header(stbi__jpeg *z, int scan)
static int stbi__decode_jpeg_image(stbi__jpeg *j)
{
int m;
for (m = 0; m < 4; m++) {
j->img_comp[m].raw_data = NULL;
j->img_comp[m].raw_coeff = NULL;
}
j->restart_interval = 0;
if (!stbi__decode_jpeg_header(j, STBI__SCAN_load)) return 0;
m = stbi__get_marker(j);
@ -3378,8 +3387,10 @@ static int stbi__zbuild_huffman(stbi__zhuffman *z, stbi_uc *sizelist, int num)
for (i=0; i < num; ++i)
++sizes[sizelist[i]];
sizes[0] = 0;
for (i=1; i < 16; ++i)
for (i=1; i < 16; ++i) {
STBI_ASSERT(sizes[i] <= (1 << i));
if (sizes[i] > (1 << i)) return stbi__err("bad sizes", "Corrupt PNG");
}
code = 0;
for (i=1; i < 16; ++i) {
next_code[i] = code;
@ -3387,7 +3398,7 @@ static int stbi__zbuild_huffman(stbi__zhuffman *z, stbi_uc *sizelist, int num)
z->firstsymbol[i] = (stbi__uint16) k;
code = (code + sizes[i]);
if (sizes[i])
if (code-1 >= (1 << i)) return stbi__err("bad codelengths","Corrupt JPEG");
if (code-1 >= (1 << i)) return stbi__err("bad codelengths","Corrupt PNG");
z->maxcode[i] = code << (16-i); // preshift for inner loop
code <<= 1;
k += sizes[i];
@ -3556,9 +3567,9 @@ static int stbi__parse_huffman_block(stbi__zbuf *a)
p = (stbi_uc *) (zout - dist);
if (dist == 1) { // run of one byte; common in images.
stbi_uc v = *p;
do *zout++ = v; while (--len);
if (len) do *zout++ = v; while (--len);
} else {
do *zout++ = *p++; while (--len);
if (len) do *zout++ = *p++; while (--len);
}
}
}
@ -3587,6 +3598,7 @@ static int stbi__compute_huffman_codes(stbi__zbuf *a)
while (n < hlit + hdist) {
int c = stbi__zhuffman_decode(a, &z_codelength);
STBI_ASSERT(c >= 0 && c < 19);
if (c < 0 || c >= 19) return stbi__err("bad codelengths", "Corrupt PNG");
if (c < 16)
lencodes[n++] = (stbi_uc) c;
else if (c == 16) {
@ -4283,6 +4295,7 @@ static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp)
if (first) return stbi__err("first not IHDR", "Corrupt PNG");
if (pal_img_n && !pal_len) return stbi__err("no PLTE","Corrupt PNG");
if (scan == STBI__SCAN_header) { s->img_n = pal_img_n; return 1; }
if ((int)(ioff + c.length) < (int)ioff) return 0;
if (ioff + c.length > idata_limit) {
stbi_uc *p;
if (idata_limit == 0) idata_limit = c.length > 4096 ? c.length : 4096;
@ -4799,7 +4812,7 @@ static stbi_uc *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int
*y = tga_height;
if (comp) *comp = tga_comp;
tga_data = (unsigned char*)stbi__malloc( tga_width * tga_height * tga_comp );
tga_data = (unsigned char*)stbi__malloc( (size_t)tga_width * tga_height * tga_comp );
if (!tga_data) return stbi__errpuc("outofmem", "Out of memory");
// skip to the data's starting position (offset usually = 0)
@ -5460,6 +5473,7 @@ static stbi_uc *stbi__process_gif_raster(stbi__context *s, stbi__gif *g)
stbi__gif_lzw *p;
lzw_cs = stbi__get8(s);
if (lzw_cs > 12) return NULL;
clear = 1 << lzw_cs;
first = 1;
codesize = lzw_cs + 1;