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Re: [Qemu-devel] [PATCH RFC 1/5] Fix segmentation fault when qemu_signal
From: |
Markus Armbruster |
Subject: |
Re: [Qemu-devel] [PATCH RFC 1/5] Fix segmentation fault when qemu_signal_init fails |
Date: |
Wed, 28 Nov 2018 13:53:52 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) |
Fei Li <address@hidden> writes:
> When qemu_signal_init() fails in qemu_init_main_loop(), we return
> without setting an error. Its callers crash then when they try to
> report the error with error_report_err().
Yes, that's a bug. Broken in 2f78e491d7b, v2.2.0. Has escaped notice
since qemu_signalfd() is quite unlikely to fail. Could go into 3.1 as a
bug fix, but I think punting it to the next release is just fine.
> To avoid such segmentation fault, add a new Error parameter to make
> the call trace to propagate the err to the final caller.
>
Let's add:
Fixes: 2f78e491d7b46542158ce0b8132ee4e05bc0ade4
> Cc: Markus Armbruster <address@hidden>
> Cc: Fam Zheng <address@hidden>
> Signed-off-by: Fei Li <address@hidden>
> Reviewed-by: Fam Zheng <address@hidden>
> ---
> util/main-loop.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/util/main-loop.c b/util/main-loop.c
> index affe0403c5..443cb4cfe8 100644
> --- a/util/main-loop.c
> +++ b/util/main-loop.c
> @@ -71,7 +71,7 @@ static void sigfd_handler(void *opaque)
> }
> }
>
> -static int qemu_signal_init(void)
> +static int qemu_signal_init(Error **errp)
> {
> int sigfd;
> sigset_t set;
> @@ -96,7 +96,7 @@ static int qemu_signal_init(void)
> sigdelset(&set, SIG_IPI);
> sigfd = qemu_signalfd(&set);
> if (sigfd == -1) {
> - fprintf(stderr, "failed to create signalfd\n");
> + error_setg_errno(errp, errno, "failed to create signalfd");
> return -errno;
> }
>
> @@ -109,7 +109,7 @@ static int qemu_signal_init(void)
>
> #else /* _WIN32 */
>
> -static int qemu_signal_init(void)
> +static int qemu_signal_init(Error **errp)
> {
> return 0;
> }
> @@ -148,7 +148,7 @@ int qemu_init_main_loop(Error **errp)
>
> init_clocks(qemu_timer_notify_cb);
>
> - ret = qemu_signal_init();
> + ret = qemu_signal_init(errp);
> if (ret) {
> return ret;
> }
Reviewed-by: Markus Armbruster <address@hidden>
- [Qemu-devel] [PATCH RFC 0/5] fix some segmentation faults and migration issues, Fei Li, 2018/11/28
- [Qemu-devel] [PATCH RFC 4/5] migration: remove unused &local_err parameter in multifd_save_cleanup, Fei Li, 2018/11/28
- [Qemu-devel] [PATCH RFC 5/5] migration: add more error handling for postcopy_ram_enable_notify, Fei Li, 2018/11/28
- [Qemu-devel] [PATCH RFC 3/5] migration: fix the multifd code when receiving less channels, Fei Li, 2018/11/28
- [Qemu-devel] [PATCH RFC 2/5] qemu_thread_join: fix segmentation fault, Fei Li, 2018/11/28
- [Qemu-devel] [PATCH RFC 1/5] Fix segmentation fault when qemu_signal_init fails, Fei Li, 2018/11/28
- Re: [Qemu-devel] [PATCH RFC 1/5] Fix segmentation fault when qemu_signal_init fails,
Markus Armbruster <=