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fix: add buffer-length check in imgfb.c #9

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fix: add buffer-length check in imgfb.c #9

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10 changes: 6 additions & 4 deletions gpu/imgfb/imgfb.c
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Original file line number Diff line number Diff line change
Expand Up @@ -47,7 +47,9 @@ uint8_t *decode_farbfeld(FILE *fp, uint32_t *width_, uint32_t *height_) {
uint32_t width = fgetc(fp) << 030 | fgetc(fp) << 020 | fgetc(fp) << 010 | fgetc(fp); // big endian = highest byte comes first
uint32_t height = fgetc(fp) << 030 | fgetc(fp) << 020 | fgetc(fp) << 010 | fgetc(fp);
uint8_t *pixels;
pixels = malloc(width * height * 4);
if (width != 0 && height > SIZE_MAX / width) { eprintf("image too large\n"); return NULL; }
size_t npixels = (size_t)width * height;
pixels = calloc(npixels, 4);
if (!pixels) { eprintf("malloc: %s\n", strerr); return NULL; }
*width_ = width;
*height_ = height;
Expand Down Expand Up @@ -142,13 +144,13 @@ int main(int argc, char *argv[]) {

fb_path = malloc(strlen(fb_) + 10);
if (!fb_path) { eprintf("malloc: %s\n", strerr); return errno; }
sprintf(fb_path, "/dev/%s", fb_);
snprintf(fb_path, strlen(fb_) + 10, "/dev/%s", fb_);
size_path = malloc(strlen(fb_) + 50);
if (!size_path) { eprintf("malloc: %s\n", strerr); return errno; }
sprintf(size_path, "/sys/class/graphics/%s/virtual_size", fb_);
snprintf(size_path, strlen(fb_) + 50, "/sys/class/graphics/%s/virtual_size", fb_);
bpp_path = malloc(strlen(fb_) + 50);
if (!bpp_path) { eprintf("malloc: %s\n", strerr); return errno; }
sprintf(bpp_path, "/sys/class/graphics/%s/bits_per_pixel", fb_);
snprintf(bpp_path, strlen(fb_) + 50, "/sys/class/graphics/%s/bits_per_pixel", fb_);
offset_x = atoi(x_);
offset_y = atoi(y_);
}
Expand Down