bug#35259: 27.0.50; Segmentation fault (xstrdup gdk_monitor_get_model)

bug#35259: 27.0.50; Segmentation fault (xstrdup gdk_monitor_get_model)

[Jhair Tocancipa Triana]

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Emacs crashes randomly, sometimes when clicking links in eww. The crash
is not easily reproducible, nevertheless the core dump points to a
segfault at xfns.c:

a35e06bbe27 (Alexander Gramiak   2019-04-06 5033)       mi->name = xstrdup (gdk_monitor_get_model (monitor));

gkd_monitor_get_model is returning NULL in my case causing the segfault
at xstrdup.

The gkd_monitor_get_model documentation says the function may return
NULL.

https://developer.gnome.org/gdk3/stable/GdkMonitor.html#gdk-monitor-get-model

Maybe we need to guard against a NULL return value.

Please find attached the bt full gdb output.


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In GNU Emacs 27.0.50 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.4)
 of 2019-04-13 built on DE1-JT-Ubuntu
Repository revision: f9694a713824d402bcba01064ac2f95156bf4161
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12001000
System Description: Ubuntu 18.10

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-- 
Key fingerprint = 5917 806E 3A2F 659B BE6A  8DEE 04B5 52D9 BC07 29A4

bug#35259: 27.0.50; Segmentation fault (xstrdup gdk_monitor_get_model)

[Alex Gramiak]

Jhair Tocancipa Triana <jhair.tocancipa@gmail.com> writes:

> Emacs crashes randomly, sometimes when clicking links in eww. The crash
> is not easily reproducible, nevertheless the core dump points to a
> segfault at xfns.c:
>
> a35e06bbe27 (Alexander Gramiak   2019-04-06 5033)       mi->name = xstrdup (gdk_monitor_get_model (monitor));
>
> gkd_monitor_get_model is returning NULL in my case causing the segfault
> at xstrdup.
>
> The gkd_monitor_get_model documentation says the function may return
> NULL.
>
> https://developer.gnome.org/gdk3/stable/GdkMonitor.html#gdk-monitor-get-model
>
> Maybe we need to guard against a NULL return value.
>
> Please find attached the bt full gdb output.

I just pushed commit 7308c2edf which should fix this. Can you confirm?
If you can't easily reproduce it, could you see if it crashed before
when just calling M-: (x-display-monitor-attributes-list)?

Sorry for the trouble.

bug#35259: 27.0.50; Segmentation fault (xstrdup gdk_monitor_get_model)

[Basil L. Contovounesios]

Jhair Tocancipa Triana <jhair.tocancipa@gmail.com> writes:

> Emacs crashes randomly, sometimes when clicking links in eww. The crash
> is not easily reproducible, nevertheless the core dump points to a
> segfault at xfns.c:
>
> a35e06bbe27 (Alexander Gramiak 2019-04-06 5033) mi->name = xstrdup
> (gdk_monitor_get_model (monitor));
>
> gkd_monitor_get_model is returning NULL in my case causing the segfault
> at xstrdup.
>
> The gkd_monitor_get_model documentation says the function may return
> NULL.
>
> https://developer.gnome.org/gdk3/stable/GdkMonitor.html#gdk-monitor-get-model
>
> Maybe we need to guard against a NULL return value.

This sounds related to and explains at least part of bug#35204.

https://debbugs.gnu.org/35204

-- 
Basil

bug#35259: 27.0.50; Segmentation fault (xstrdup gdk_monitor_get_model)

[Jhair Tocancipa Triana]

As suggested, before commit 7308c2edf evaluating
x-display-monitor-attributes-list triggers the segfault:

,----
| $ ./emacs -Q --eval "(x-display-monitor-attributes-list)"
| ...
| /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xeb)[0x7f880cf3509b]
| ./emacs(+0x3f13a)[0x561dbeb0813a]
| Segmentation fault (core dumped)
`----

With commit 7308c2edf the issue was resolved.

Thanks!

Alex Gramiak <agrambot@gmail.com> writes:

> Jhair Tocancipa Triana <jhair.tocancipa@gmail.com> writes:
>
>> Emacs crashes randomly, sometimes when clicking links in eww. The crash
>> is not easily reproducible, nevertheless the core dump points to a
>> segfault at xfns.c:
>>
>> a35e06bbe27 (Alexander Gramiak 2019-04-06 5033) mi->name = xstrdup
>> (gdk_monitor_get_model (monitor));
>>
>> gkd_monitor_get_model is returning NULL in my case causing the segfault
>> at xstrdup.
>>
>> The gkd_monitor_get_model documentation says the function may return
>> NULL.
>>
>> https://developer.gnome.org/gdk3/stable/GdkMonitor.html#gdk-monitor-get-model
>>
>> Maybe we need to guard against a NULL return value.
>>
>> Please find attached the bt full gdb output.
>
> I just pushed commit 7308c2edf which should fix this. Can you confirm?
> If you can't easily reproduce it, could you see if it crashed before
> when just calling M-: (x-display-monitor-attributes-list)?
>
> Sorry for the trouble.
>
>
>
>

-- 
Key fingerprint = 5917 806E 3A2F 659B BE6A  8DEE 04B5 52D9 BC07 29A4

bug#35259: 27.0.50; Segmentation fault (xstrdup gdk_monitor_get_model)

[Alex Gramiak]

merge 35259 35204
close 35259
quit

Jhair Tocancipa Triana <jhair.tocancipa@gmail.com> writes:

> As suggested, before commit 7308c2edf evaluating
> x-display-monitor-attributes-list triggers the segfault:
>
> ,----
> | $ ./emacs -Q --eval "(x-display-monitor-attributes-list)"
> | ...
> | /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xeb)[0x7f880cf3509b]
> | ./emacs(+0x3f13a)[0x561dbeb0813a]
> | Segmentation fault (core dumped)
> `----
>
> With commit 7308c2edf the issue was resolved.
>
> Thanks!

Katsumi Yamaoka <yamaoka@jpl.org> writes:

> On Sun, 14 Apr 2019 02:15:00 +0000, Ken Brown wrote:
>>> It should be fixed with commit 7308c2edf, so please test again. Sorry
>>> for the inconvenience.
>
>> Yes, that fixes it for me.
>
> Emacs built from the fresh git master works fine.  Thanks a lot!

Thanks for testing.