libcurl: apply source build patch

Author: IanButterworth

deps/curl.mk

@@ -34,6 +34,10 @@ $(SRCCACHE)/curl-$(CURL_VER)/source-extracted: $(SRCCACHE)/curl-$(CURL_VER).tar.
 	cd $(dir $<) && $(TAR) jxf $(notdir $<)
 	echo 1 > $@
 
+$(SRCCACHE)/curl-$(CURL_VER)/curl-eventfd-double-close.patch-applied: $(SRCCACHE)/curl-$(CURL_VER)/source-extracted
+	cd $(SRCCACHE)/curl-$(CURL_VER) && patch -p1 -f -u -l < $(SRCDIR)/patches/curl-eventfd-double-close.patch
+	echo 1 > $@
+
 checksum-curl: $(SRCCACHE)/curl-$(CURL_VER).tar.bz2
 	$(JLCHECKSUM) $<
 
@@ -65,7 +69,7 @@ CURL_TLS_CONFIGURE_FLAGS := --with-openssl
 endif
 CURL_CONFIGURE_FLAGS += $(CURL_TLS_CONFIGURE_FLAGS)
 
-$(BUILDDIR)/curl-$(CURL_VER)/build-configured: $(SRCCACHE)/curl-$(CURL_VER)/source-extracted
+$(BUILDDIR)/curl-$(CURL_VER)/build-configured: $(SRCCACHE)/curl-$(CURL_VER)/source-extracted $(SRCCACHE)/curl-$(CURL_VER)/curl-eventfd-double-close.patch-applied
 	mkdir -p $(dir $@)
 	cd $(dir $@) && \
 	$(dir $<)/configure $(CURL_CONFIGURE_FLAGS) \

deps/patches/curl-eventfd-double-close.patch

@@ -0,0 +1,35 @@
+From ff5091aa9f73802e894b1cbdf24ab84e103200e2 Mon Sep 17 00:00:00 2001
+From: Andy Pan <[email protected]>
+Date: Thu, 12 Dec 2024 12:48:56 +0000
+Subject: [PATCH] async-thread: avoid closing eventfd twice
+
+When employing eventfd for socketpair, there is only one file
+descriptor. Closing that fd twice might result in fd corruption.
+Thus, we should avoid closing the eventfd twice, following the
+pattern in lib/multi.c.
+
+Fixes #15725
+Closes #15727
+Reported-by: Christian Heusel
+---
+ lib/asyn-thread.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/lib/asyn-thread.c b/lib/asyn-thread.c
+index a58e4b790494..32d496b107cb 100644
+--- a/lib/asyn-thread.c
++++ b/lib/asyn-thread.c
+@@ -195,9 +195,11 @@ void destroy_thread_sync_data(struct thread_sync_data *tsd)
+    * close one end of the socket pair (may be done in resolver thread);
+    * the other end (for reading) is always closed in the parent thread.
+    */
++#ifndef USE_EVENTFD
+   if(tsd->sock_pair[1] != CURL_SOCKET_BAD) {
+     wakeup_close(tsd->sock_pair[1]);
+   }
++#endif
+ #endif
+ 
+   memset(tsd, 0, sizeof(*tsd));
+-- 
+2.47.1