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-rw-r--r--lib/multi.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/multi.c b/lib/multi.c
index 5753f58f7..217849c5a 100644
--- a/lib/multi.c
+++ b/lib/multi.c
@@ -1022,6 +1022,10 @@ CURLMcode curl_multi_wait(struct Curl_multi *multi,
if(nfds) {
if(nfds > NUM_POLLS_ON_STACK) {
+ /* 'nfds' is a 32 bit value and 'struct pollfd' is typically 8 bytes
+ big, so at 2^29 sockets this value might wrap. When a process gets
+ the capability to actually handle over 500 million sockets this
+ calculation needs a integer overflow check. */
ufds = malloc(nfds * sizeof(struct pollfd));
if(!ufds)
return CURLM_OUT_OF_MEMORY;