Re: [PATCH] fbdev: fix divide error in fb_var_to_videomode

[Bartlomiej Zolnierkiewicz]

On 03/29/2019 09:46 PM, Mukesh Ojha wrote:
> 
> On 3/19/2019 5:50 PM, shile.zhang@xxxxxxxxxxxxxxxxx wrote:
>> From: Shile Zhang <shile.zhang@xxxxxxxxxxxxxxxxx>
>>
>> To fix following divide-by-zero error found by Syzkaller:
>>
>>    divide error: 0000 [#1] SMP PTI
>>    CPU: 7 PID: 8447 Comm: test Kdump: loaded Not tainted 4.19.24-8.al7.x86_64 #1
>>    Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS rel-1.12.0-0-ga698c8995f-prebuilt.qemu.org 04/01/2014
>>    RIP: 0010:fb_var_to_videomode+0xae/0xc0
>>    Code: 04 44 03 46 78 03 4e 7c 44 03 46 68 03 4e 70 89 ce d1 ee 69 c0 e8 03 00 00 f6 c2 01 0f 45 ce 83 e2 02 8d 34 09 0f 45 ce 31 d2 <41> f7 f0 31 d2 f7 f1 89 47 08 f3 c3 66 0f 1f 44 00 00 0f 1f 44 00
>>    RSP: 0018:ffffb7e189347bf0 EFLAGS: 00010246
>>    RAX: 00000000e1692410 RBX: ffffb7e189347d60 RCX: 0000000000000000
>>    RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffb7e189347c10
>>    RBP: ffff99972a091c00 R08: 0000000000000000 R09: 0000000000000000
>>    R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000100
>>    R13: 0000000000010000 R14: 00007ffd66baf6d0 R15: 0000000000000000
>>    FS:  00007f2054d11740(0000) GS:ffff99972fbc0000(0000) knlGS:0000000000000000
>>    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>    CR2: 00007f205481fd20 CR3: 00000004288a0001 CR4: 00000000001606a0
>>    Call Trace:
>>     fb_set_var+0x257/0x390
>>     ? lookup_fast+0xbb/0x2b0
>>     ? fb_open+0xc0/0x140
>>     ? chrdev_open+0xa6/0x1a0
>>     do_fb_ioctl+0x445/0x5a0
>>     do_vfs_ioctl+0x92/0x5f0
>>     ? __alloc_fd+0x3d/0x160
>>     ksys_ioctl+0x60/0x90
>>     __x64_sys_ioctl+0x16/0x20
>>     do_syscall_64+0x5b/0x190
>>     entry_SYSCALL_64_after_hwframe+0x44/0xa9
>>    RIP: 0033:0x7f20548258d7
>>    Code: 44 00 00 48 8b 05 b9 15 2d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 89 15 2d 00 f7 d8 64 89 01 48
>>
>> It can be triggered easily with following test code:
>>
>>    #include <linux/fb.h>
>>    #include <fcntl.h>
>>    #include <sys/ioctl.h>
>>    int main(void)
>>    {
>>            struct fb_var_screeninfo var = {.activate = 0x100, .pixclock = 60};
>>            int fd = open("/dev/fb0", O_RDWR);
>>            if (fd < 0)
>>                    return 1;
>>
>>            if (ioctl(fd, FBIOPUT_VSCREENINFO, &var))
>>                    return 1;
>>
>>            return 0;
>>    }
>>
>> Signed-off-by: Shile Zhang <shile.zhang@xxxxxxxxxxxxxxxxx>
> 
> To avoid any exception we should include the check.
> Looks fine to me.
> Reviewed-by: Mukesh Ojha <mojha@xxxxxxxxxxxxxx>

Patch queued for v5.2, thanks.

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics