Bug 4027 - BUG: null-ptr-deref bug in buffer_prepare()
Summary: BUG: null-ptr-deref bug in buffer_prepare()
Status: RESOLVED FIXED
Alias: None
Product: ANCK 5.10 Dev
Classification: ANCK
Component: drivers (show other bugs) drivers
Version: 5.10.y-13
Hardware: All Linux
: P3-Medium S3-normal
Target Milestone: ---
Assignee: GuixinLiu
QA Contact: shuming
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2023-02-10 09:26 UTC by ljubomir
Modified: 2023-02-28 19:36 UTC (History)
2 users (show)

See Also:

Attachments
Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description ljubomir inspur_group 2023-02-10 09:26:04 UTC 
Description of problem:
 When the driver calls cx88_risc_buffer() to prepare the buffer, the
    function call may fail, resulting in a empty buffer and null-ptr-deref
    later in buffer_queue().

    The following log can reveal it:

    [   41.822762] general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI
    [   41.824488] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
    [   41.828027] RIP: 0010:buffer_queue+0xc2/0x500
    [   41.836311] Call Trace:
    [   41.836945]  __enqueue_in_driver+0x141/0x360
    [   41.837262]  vb2_start_streaming+0x62/0x4a0
    [   41.838216]  vb2_core_streamon+0x1da/0x2c0
    [   41.838516]  __vb2_init_fileio+0x981/0xbc0
    [   41.839141]  __vb2_perform_fileio+0xbf9/0x1120
    [   41.840072]  vb2_fop_read+0x20e/0x400
    [   41.840346]  v4l2_read+0x215/0x290
    [   41.840603]  vfs_read+0x162/0x4c0


Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:


Additional info:
Comment 1 maqiao alibaba_cloud_group 2023-02-28 19:36:58 UTC 
merged: https://gitee.com/anolis/cloud-kernel/pulls/1165