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wolfssl-examples
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Give each PSK thread its own heap copy of connfd 

Pass a per-connection malloc'd descriptor instead of the address of the reused stack variable connfd, which the next accept() could overwrite before the thread dereferences it; the thread frees it after copying.
pull/582/head
night1rider 2026-06-30 10:02:24 -06:00
parent 54f85adb37
commit 5b00968010
1 changed files with 19 additions and 1 deletions
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20
psk/server-psk-threaded.c
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@ -78,6 +78,10 @@ void* wolfssl_thread(void* fd)
char buf[MAXLINE];
char response[] = "I hear ya for shizzle";
/* fd was heap-allocated per connection by main(); free it now that the
* descriptor has been copied into connfd. */
free(fd);
memset(buf, 0, MAXLINE);
/* create WOLFSSL object */
@ -230,12 +234,26 @@ int main()
return 1;
}
else {
int* connfd_ptr;
printf("Connection from %s, port %d\n",
inet_ntop(AF_INET, &cliAddr.sin_addr, buff, sizeof(buff)),
ntohs(cliAddr.sin_port));
if (pthread_create(&thread, NULL, &wolfssl_thread, (void*) &connfd)
/* Give each thread its own heap-allocated copy of the descriptor;
* passing &connfd would let the next accept() overwrite it. */
connfd_ptr = malloc(sizeof(int));
if (connfd_ptr == NULL) {
printf("Fatal error : malloc error\n");
close(connfd);
return 1;
}
*connfd_ptr = connfd;
if (pthread_create(&thread, NULL, &wolfssl_thread, connfd_ptr)
!= 0) {
close(connfd);
free(connfd_ptr);
return 1;
}
if (pthread_detach(thread) != 0) {