[PATCH 1/2] chardev: Fix record/replay error path NULL deref in device creation

[Nicholas Piggin]

qemu_chardev_set_replay() was being called in chardev creation to
set up replay parameters even if the chardev is NULL.

A segfault can be reproduced by specifying '-serial chardev:bad' with
an rr=record mode.

Fix this with a NULL pointer check.

Reported-by: Peter Maydell <peter.maydell@linaro.org>
Resolves: Coverity CID 1559470
Fixes: 4c193bb129dae ("chardev: set record/replay on the base device of a muxed 
device")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 chardev/char.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/chardev/char.c b/chardev/char.c
index ba847b6e9e..47a744ebeb 100644
--- a/chardev/char.c
+++ b/chardev/char.c
@@ -721,7 +721,7 @@ static Chardev *__qemu_chr_new(const char *label, const 
char *filename,
 
     if (strstart(filename, "chardev:", &p)) {
         chr = qemu_chr_find(p);
-        if (replay) {
+        if (replay && chr) {
             qemu_chardev_set_replay(chr, &err);
             if (err) {
                 error_report_err(err);
-- 
2.45.2