* [PATCH] Cygwin: fhandler_base: Fix double free caused when open() fails.
@ 2022-01-17 23:05 Takashi Yano
2022-01-18 11:05 ` Corinna Vinschen
0 siblings, 1 reply; 2+ messages in thread
From: Takashi Yano @ 2022-01-17 23:05 UTC (permalink / raw)
To: cygwin-patches
- When open fails, archetype stored in archetypes[] is not cleared.
This causes double free when next open fail. This patch fixes the
issue.
Addresses:
https://cygwin.com/pipermail/cygwin/2022-January/250518.html
---
winsup/cygwin/fhandler.cc | 4 ++--
winsup/cygwin/release/3.3.4 | 3 +++
2 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/winsup/cygwin/fhandler.cc b/winsup/cygwin/fhandler.cc
index fc7c0422e..7d427135e 100644
--- a/winsup/cygwin/fhandler.cc
+++ b/winsup/cygwin/fhandler.cc
@@ -440,8 +440,8 @@ fhandler_base::open_with_arch (int flags, mode_t mode)
if (!(res = (archetype && archetype->io_handle)
|| open (flags, mode & 07777)))
{
- if (archetype)
- delete archetype;
+ if (archetype && archetype->usecount == 0)
+ cygheap->fdtab.delete_archetype (archetype);
}
else if (archetype)
{
diff --git a/winsup/cygwin/release/3.3.4 b/winsup/cygwin/release/3.3.4
index 7c37a575c..71f8dc888 100644
--- a/winsup/cygwin/release/3.3.4
+++ b/winsup/cygwin/release/3.3.4
@@ -23,3 +23,6 @@ Bug Fixes
- Fix an "Invalid argument" problem in posix_spawn on i686.
Addresses: https://cygwin.com/pipermail/cygwin/2022-January/250453.html
+
+- Fix double free for archetype, which is caused when open() fails.
+ Addresses: https://cygwin.com/pipermail/cygwin/2022-January/250518.html
--
2.34.1
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2022-01-17 23:05 [PATCH] Cygwin: fhandler_base: Fix double free caused when open() fails Takashi Yano
2022-01-18 11:05 ` Corinna Vinschen
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