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Fix a crash in the TGA loader with malformed input

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This commit is contained in:
Hein-Pieter van Braam-Stewart 2021-02-04 13:00:06 +01:00
parent 1d1310f3d7
commit 403e4fd08b
2 changed files with 23 additions and 4 deletions
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25
modules/tga/image_loader_tga.cpp
View File

@ -56,6 +56,10 @@ Error ImageLoaderTGA::decode_tga_rle(const uint8_t *p_compressed_buffer, size_t
compressed_pos += 1;
count = (c & 0x7f) + 1;
if (output_pos + count * p_pixel_size > output_pos) {
return ERR_PARSE_ERROR;
}
if (c & 0x80) {
for (size_t i = 0; i < p_pixel_size; i++) {
pixels_w[i] = p_compressed_buffer[compressed_pos];
@ -79,7 +83,7 @@ Error ImageLoaderTGA::decode_tga_rle(const uint8_t *p_compressed_buffer, size_t
return OK;
}
Error ImageLoaderTGA::convert_to_image(Ref<Image> p_image, const uint8_t *p_buffer, const tga_header_s &p_header, const uint8_t *p_palette, const bool p_is_monochrome) {
Error ImageLoaderTGA::convert_to_image(Ref<Image> p_image, const uint8_t *p_buffer, const tga_header_s &p_header, const uint8_t *p_palette, const bool p_is_monochrome, size_t p_output_size) {
#define TGA_PUT_PIXEL(r, g, b, a) \
int image_data_ofs = ((y * width) + x); \
image_data_w[image_data_ofs * 4 + 0] = r; \
@ -130,6 +134,9 @@ Error ImageLoaderTGA::convert_to_image(Ref<Image> p_image, const uint8_t *p_buff
if (p_is_monochrome) {
while (y != y_end) {
while (x != x_end) {
if (i > p_output_size) {
return ERR_PARSE_ERROR;
}
uint8_t shade = p_buffer[i];
TGA_PUT_PIXEL(shade, shade, shade, 0xff)
@ -143,6 +150,9 @@ Error ImageLoaderTGA::convert_to_image(Ref<Image> p_image, const uint8_t *p_buff
} else {
while (y != y_end) {
while (x != x_end) {
if (i > p_output_size) {
return ERR_PARSE_ERROR;
}
uint8_t index = p_buffer[i];
uint8_t r = 0x00;
uint8_t g = 0x00;
@ -171,6 +181,10 @@ Error ImageLoaderTGA::convert_to_image(Ref<Image> p_image, const uint8_t *p_buff
} else if (p_header.pixel_depth == 24) {
while (y != y_end) {
while (x != x_end) {
if (i + 2 > p_output_size) {
return ERR_PARSE_ERROR;
}
uint8_t r = p_buffer[i + 2];
uint8_t g = p_buffer[i + 1];
uint8_t b = p_buffer[i + 0];
@ -186,6 +200,10 @@ Error ImageLoaderTGA::convert_to_image(Ref<Image> p_image, const uint8_t *p_buff
} else if (p_header.pixel_depth == 32) {
while (y != y_end) {
while (x != x_end) {
if (i + 3 > p_output_size) {
return ERR_PARSE_ERROR;
}
uint8_t a = p_buffer[i + 3];
uint8_t r = p_buffer[i + 2];
uint8_t g = p_buffer[i + 1];
@ -279,7 +297,7 @@ Error ImageLoaderTGA::load_image(Ref<Image> p_image, FileAccess *f, bool p_force
const uint8_t *src_image_r = src_image.ptr();
const size_t pixel_size = tga_header.pixel_depth >> 3;
const size_t buffer_size = (tga_header.image_width * tga_header.image_height) * pixel_size;
size_t buffer_size = (tga_header.image_width * tga_header.image_height) * pixel_size;
Vector<uint8_t> uncompressed_buffer;
uncompressed_buffer.resize(buffer_size);
@ -297,11 +315,12 @@ Error ImageLoaderTGA::load_image(Ref<Image> p_image, FileAccess *f, bool p_force
}
} else {
buffer = src_image_r;
buffer_size = src_image_len;
};
if (err == OK) {
const uint8_t *palette_r = palette.ptr();
err = convert_to_image(p_image, buffer, tga_header, palette_r, is_monochrome);
err = convert_to_image(p_image, buffer, tga_header, palette_r, is_monochrome, buffer_size);
}
}

2
modules/tga/image_loader_tga.h
View File

@ -73,7 +73,7 @@ class ImageLoaderTGA : public ImageFormatLoader {
uint8_t image_descriptor;
};
static Error decode_tga_rle(const uint8_t *p_compressed_buffer, size_t p_pixel_size, uint8_t *p_uncompressed_buffer, size_t p_output_size);
static Error convert_to_image(Ref<Image> p_image, const uint8_t *p_buffer, const tga_header_s &p_header, const uint8_t *p_palette, const bool p_is_monochrome);
static Error convert_to_image(Ref<Image> p_image, const uint8_t *p_buffer, const tga_header_s &p_header, const uint8_t *p_palette, const bool p_is_monochrome, size_t p_output_size);
public:
virtual Error load_image(Ref<Image> p_image, FileAccess *f, bool p_force_linear, float p_scale);