From: Takashi Yano <takashi.yano@nifty.ne.jp>
To: cygwin-patches@cygwin.com
Cc: Takashi Yano <takashi.yano@nifty.ne.jp>
Subject: [PATCH] Cygwin: pty: Add missing pinfo check in transfer_input().
Date: Wed, 16 Aug 2023 08:35:06 +0900 [thread overview]
Message-ID: <20230815233506.1390-1-takashi.yano@nifty.ne.jp> (raw)
The commit 10d083c745dd has a bug that lacks a check for pinfo pointer
value for master_pid. This causes segmentation fault if the process
whose pid is master_pid no longer exists. This patch fixes the issue.
Fixes: 10d083c745dd ("Cygwin: pty: Inherit typeahead data between two input pipes.")
Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>
---
winsup/cygwin/fhandler/pty.cc | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/winsup/cygwin/fhandler/pty.cc b/winsup/cygwin/fhandler/pty.cc
index db3b77ecf..607333f52 100644
--- a/winsup/cygwin/fhandler/pty.cc
+++ b/winsup/cygwin/fhandler/pty.cc
@@ -3835,7 +3835,9 @@ fhandler_pty_slave::transfer_input (tty::xfer_dir dir, HANDLE from, tty *ttyp,
to = ttyp->to_slave ();
pinfo p (ttyp->master_pid);
- HANDLE pty_owner = OpenProcess (PROCESS_DUP_HANDLE, FALSE, p->dwProcessId);
+ HANDLE pty_owner = NULL;
+ if (p)
+ pty_owner = OpenProcess (PROCESS_DUP_HANDLE, FALSE, p->dwProcessId);
if (pty_owner)
{
DuplicateHandle (pty_owner, to, GetCurrentProcess (), &to,
--
2.39.0
reply other threads:[~2023-08-15 23:35 UTC|newest]
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