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Fix CVE-2017-8798.
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8798
http://seclists.org/oss-sec/2017/q2/247
Patch copied from upstream source repository, with Changelog entry removed:
https://github.com/miniupnp/miniupnp/commit/f0f1f4b22d6a98536377a1bb07e7c20e4703d229
diff --git a/miniwget.c b/miniwget.c
index 37cb47b..1eda57c 100644
--- a/miniwget.c
+++ b/miniwget.c
@@ -284,11 +284,12 @@ getHTTPResponse(int s, int * size, int * status_code)
goto end_of_stream;
}
}
- bytestocopy = ((int)chunksize < (n - i))?chunksize:(unsigned int)(n - i);
+ /* it is guaranteed that (n >= i) */
+ bytestocopy = (chunksize < (unsigned int)(n - i))?chunksize:(unsigned int)(n - i);
if((content_buf_used + bytestocopy) > content_buf_len)
{
char * tmp;
- if(content_length >= (int)(content_buf_used + bytestocopy)) {
+ if((content_length >= 0) && ((unsigned int)content_length >= (content_buf_used + bytestocopy))) {
content_buf_len = content_length;
} else {
content_buf_len = content_buf_used + bytestocopy;
@@ -313,14 +314,15 @@ getHTTPResponse(int s, int * size, int * status_code)
{
/* not chunked */
if(content_length > 0
- && (int)(content_buf_used + n) > content_length) {
+ && (content_buf_used + n) > (unsigned int)content_length) {
/* skipping additional bytes */
n = content_length - content_buf_used;
}
if(content_buf_used + n > content_buf_len)
{
char * tmp;
- if(content_length >= (int)(content_buf_used + n)) {
+ if(content_length >= 0
+ && (unsigned int)content_length >= (content_buf_used + n)) {
content_buf_len = content_length;
} else {
content_buf_len = content_buf_used + n;
@@ -340,7 +342,7 @@ getHTTPResponse(int s, int * size, int * status_code)
}
}
/* use the Content-Length header value if available */
- if(content_length > 0 && (int)content_buf_used >= content_length)
+ if(content_length > 0 && content_buf_used >= (unsigned int)content_length)
{
#ifdef DEBUG
printf("End of HTTP content\n");
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