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multi: Change curl_multi_wait/poll to error on negative timeout

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- Add new error CURLM_BAD_FUNCTION_ARGUMENT and return that error when
  curl_multi_wait/poll is passed timeout param < 0.

Prior to this change passing a negative value to curl_multi_wait/poll
such as -1 could cause the function to wait forever.

Reported-by: hamstergene@users.noreply.github.com

Fixes https://github.com/curl/curl/issues/4763

Closes https://github.com/curl/curl/pull/4765
This commit is contained in:
Jay Satiro 2019-12-27 23:39:24 -05:00
parent ea6d6205d9
commit b700662b1c
7 changed files with 17 additions and 4 deletions
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3
lib/multi.c
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@ -1048,6 +1048,9 @@ static CURLMcode Curl_multi_wait(struct Curl_multi *multi,
if(multi->in_callback)
return CURLM_RECURSIVE_API_CALL;
if(timeout_ms < 0)
return CURLM_BAD_FUNCTION_ARGUMENT;
/* Count up how many fds we have from the multi handle */
data = multi->easyp;
while(data) {