[newlib-cygwin] Cygwin: pty: Fix segfault caused when tcflush() is called.
Corinna Vinschen
corinna@sourceware.org
Mon Feb 22 09:50:38 GMT 2021
https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=18b91fbe580e747edf0f7ef8edbec4df07bc7245
commit 18b91fbe580e747edf0f7ef8edbec4df07bc7245
Author: Takashi Yano via Cygwin-patches <cygwin-patches@cygwin.com>
Date: Sun Feb 21 07:45:16 2021 +0900
Cygwin: pty: Fix segfault caused when tcflush() is called.
- After commit 253352e796ff9ec9a447e5375f5bc3e2b92b5293, mc (midnight
commander) crashes with segfault if the shell is bash. This is due
to NULL pointer access in read(). This patch fixes the issue.
Addresses::
https://cygwin.com/pipermail/cygwin/2021-February/247870.html
Diff:
---
winsup/cygwin/fhandler_tty.cc | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/winsup/cygwin/fhandler_tty.cc b/winsup/cygwin/fhandler_tty.cc
index d30041af1..3fcaa8277 100644
--- a/winsup/cygwin/fhandler_tty.cc
+++ b/winsup/cygwin/fhandler_tty.cc
@@ -1474,8 +1474,11 @@ wait_retry:
out:
termios_printf ("%d = read(%p, %lu)", totalread, ptr, len);
len = (size_t) totalread;
- bool saw_eol = totalread > 0 && strchr ("\r\n", ptr0[totalread -1]);
- mask_switch_to_pcon_in (false, saw_eol);
+ if (ptr0)
+ { /* Not tcflush() */
+ bool saw_eol = totalread > 0 && strchr ("\r\n", ptr0[totalread -1]);
+ mask_switch_to_pcon_in (false, saw_eol);
+ }
}
int
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