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Re: [Qemu-devel] [PATCH] display: cirrus: check vga bits per pixel(bpp)


From: P J P
Subject: Re: [Qemu-devel] [PATCH] display: cirrus: check vga bits per pixel(bpp) value
Date: Mon, 5 Dec 2016 13:03:56 +0530 (IST)

+-- On Mon, 28 Nov 2016, P J P wrote --+
| +-- On Wed, 16 Nov 2016, Marc-André Lureau wrote --+
| | For completeness, do you have a reproducer and/or a backtrace?
| 
| Yes, there is.
| 
| ===
| Thread 4 "qemu-system-x86" received signal SIGFPE, Arithmetic exception.
| [Switching to Thread 0x7ffff002c700 (LWP 10506)]
| 0x000055555599fe2e in cirrus_do_copy (s=0x55555758af60, dst=0, src=0, w=2048, 
| h=4096) at hw/display/cirrus_vga.c:735
| 735             sx = (src % ABS(s->cirrus_blt_srcpitch)) / depth;
| 
| (gdb) bt
| #0  0x000055555599fe2e in cirrus_do_copy (s=0x55555758af60, dst=0, src=0, 
w=2048, h=4096) at hw/display/cirrus_vga.c:735
| #1  0x00005555559a0134 in cirrus_bitblt_videotovideo_copy (s=0x55555758af60) 
at hw/display/cirrus_vga.c:793
| #2  0x00005555559a0609 in cirrus_bitblt_videotovideo (s=0x55555758af60) at 
hw/display/cirrus_vga.c:915
| #3  0x00005555559a0d77 in cirrus_bitblt_start (s=0x55555758af60) at 
hw/display/cirrus_vga.c:1056
| #4  0x00005555559a1ad3 in cirrus_vga_write_gr (s=0x55555758af60, 
reg_index=42, reg_value=0) at hw/display/cirrus_vga.c:1572
| #5  0x00005555559a3ad8 in cirrus_vga_ioport_write (opaque=0x55555758af60, 
addr=975, val=0, size=1) at hw/display/cirrus_vga.c:2678
| #6  0x00005555557a8df7 in memory_region_write_accessor (mr=0x55555759ba50, 
addr=31, ...
| #7  0x00005555557a900f in access_with_adjusted_size (addr=31, 
value=0x7ffff002b8b8, ...
| #8  0x00005555557ab74f in memory_region_dispatch_write (mr=0x55555759ba50, 
addr=31, ...
| #9  0x0000555555757003 in address_space_write_continue (as=0x55555621b5a0 
<address_space_io>, ...
| #10 0x000055555575714b in address_space_write (as=0x55555621b5a0 
<address_space_io>, ...
| #11 0x00005555557574d7 in address_space_rw (as=0x55555621b5a0 
<address_space_io>, ...
| #12 0x00005555557a53d1 in kvm_handle_io (port=975, attrs=..., 
data=0x7ffff7ff0000, ...
| #13 0x00005555557a58d7 in kvm_cpu_exec (cpu=0x555556746f90)
| #14 0x000055555578c752 in qemu_kvm_cpu_thread_fn (arg=0x555556746f90)
| #15 0x00007ffff5e8d5ca in start_thread () from /lib64/libpthread.so.0
| #16 0x00007ffff5bc70ed in clone () from /lib64/libc.so.6
| ===
| 

Ping..!
--
Prasad J Pandit / Red Hat Product Security Team
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F


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