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qemu-char: avoid segfault if user lacks of permisson of a given logfile

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Function qemu_chr_alloc returns NULL if it failed to open logfile by any reason,
says no write permission. For backends tty, stdio and msmouse, They need to
check this return value to avoid segfault in this case.

Signed-off-by: Lin Ma <lma@suse.com>
Cc: qemu-stable <qemu-stable@nongnu.org>
Message-Id: <20160914062250.22226-1-lma@suse.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Lin Ma 2016-09-14 14:22:50 +08:00 committed by Paolo Bonzini
parent 0d8e065fc5
commit 71200fb966
2 changed files with 9 additions and 0 deletions
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3
backends/msmouse.c
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@ -159,6 +159,9 @@ static CharDriverState *qemu_chr_open_msmouse(const char *id,
CharDriverState *chr;
chr = qemu_chr_alloc(common, errp);
if (!chr) {
return NULL;
}
chr->chr_write = msmouse_chr_write;
chr->chr_close = msmouse_chr_close;
chr->chr_accept_input = msmouse_chr_accept_input;

6
qemu-char.c
View File

@ -1230,6 +1230,9 @@ static CharDriverState *qemu_chr_open_stdio(const char *id,
sigaction(SIGCONT, &act, NULL);
chr = qemu_chr_open_fd(0, 1, common, errp);
if (!chr) {
return NULL;
}
chr->chr_close = qemu_chr_close_stdio;
chr->chr_set_echo = qemu_chr_set_echo_stdio;
if (opts->has_signal) {
@ -1686,6 +1689,9 @@ static CharDriverState *qemu_chr_open_tty_fd(int fd,
tty_serial_init(fd, 115200, 'N', 8, 1);
chr = qemu_chr_open_fd(fd, fd, backend, errp);
if (!chr) {
return NULL;
}
chr->chr_ioctl = tty_serial_ioctl;
chr->chr_close = qemu_chr_close_tty;
return chr;