diff options
Diffstat (limited to 'cqrlogo.c')
| -rw-r--r-- | cqrlogo.c | 10 |
1 files changed, 7 insertions, 3 deletions
@@ -168,7 +168,7 @@ int main(int argc, char **argv) { struct bitmap_t * bitmap; char *match = NULL; - int scale = QRCODE_SCALE, border = QRCODE_BORDER; + unsigned int scale = QRCODE_SCALE, border = QRCODE_BORDER; /* get query string for later use */ char * query_string = getenv("QUERY_STRING"); @@ -204,11 +204,15 @@ int main(int argc, char **argv) { if (query_string ) { /* do we have a special scale? */ if ((match = strstr(query_string, "scale=")) != NULL) - sscanf(match, "scale=%u", &scale); + if ((sscanf(match, "scale=%u", &scale)) > 0) + if (scale < 1 || scale > QRCODE_MAX_SCALE) + scale = QRCODE_SCALE; /* width of the border? */ if ((match = strstr(query_string, "border=")) != NULL) - sscanf(match, "border=%u", &border); + if ((sscanf(match, "border=%u", &border)) > 0) + if (border > QRCODE_MAX_BORDER) + border = QRCODE_BORDER; } if ((bitmap = encode_qrcode(http_referer, scale, border)) == NULL) { |