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4ac05f48e3
Fix dereference of invalid virtual address when get a cleanuped plane state: [ 17.908207] Unable to handle kernel NULL pointer dereference at virtual address 000000000000000c [ 17.911560] Mem abort info: [ 17.911809] ESR = 0x96000006 [ 17.912081] Exception class = DABT (current EL), IL = 32 bits [ 17.912624] SET = 0, FnV = 0 [ 17.912910] EA = 0, S1PTW = 0 [ 17.913189] Data abort info: [ 17.913466] ISV = 0, ISS = 0x00000006 [ 17.913809] CM = 0, WnR = 0 [ 17.914083] user pgtable: 4k pages, 39-bit VAs, pgdp = 00000000435c7e47 [ 17.914681] [000000000000000c] pgd=000000007a6d7003, pud=000000007a6d7003, pmd=0000000000000000 [ 17.915473] Internal error: Oops: 96000006 [#1] SMP [ 17.915907] Modules linked in: bcmdhd [ 17.916240] Process weston (pid: 548, stack limit = 0x00000000f6c6eefe) [ 17.916825] CPU: 0 PID: 548 Comm: weston Not tainted 4.19.154 #312 [ 17.917368] Hardware name: Rockchip RK3566 EVB1 DDR4 V10 Linux Board (DT) [ 17.917970] pstate: 40400009 (nZcv daif +PAN -UAO) [ 17.918417] pc : vop2_crtc_bandwidth+0x21c/0x2dc [ 17.918825] lr : vop2_crtc_bandwidthwhen [ 17.632811] refcount_t: increment on 0; use-after-free. [ 17.632883] WARNING: CPU: 0 PID: 546 at lib/refcount.c:153 refcount_inc_checked+0x38/0x44 [ 17.632896] Modules linked in: bcmdhd [ 17.632922] CPU: 0 PID: 546 Comm: weston Not tainted 4.19.154 #311 [ 17.632934] Hardware name: Rockchip RK3566 EVB1 DDR4 V10 Linux Board (DT) [ 17.632943] pstate: 40400009 (nZcv daif +PAN -UAO) [ 17.632951] pc : refcount_inc_checked+0x38/0x44 [ 17.632958] lr : refcount_inc_checked+0x38/0x44 [ 17.635052] Call trace: [ 17.635069] refcount_inc_checked+0x38/0x44 [ 17.635088] drm_mode_object_get+0x40/0x4c [ 17.635104] __drm_atomic_helper_plane_duplicate_state+0x3c/0x50 [ 17.635119] vop2_atomic_plane_duplicate_state+0x4c/0x74 [ 17.635129] drm_atomic_get_plane_state+0xd0/0x154 [ 17.635137] rockchip_atomic_helper_update_plane+0x64/0x128 [ 17.635146] __setplane_atomic+0x148/0x160 [ 17.635160] drm_mode_setplane+0x1f0/0x24c [ 17.635171] drm_ioctl_kernel+0x8c/0xfc [ 17.635184] drm_ioctl+0x324/0x3b8 [ 17.635204] vfs_ioctl+0x58/0x68 [ 17.635215] do_vfs_ioctl+0xb4/0x9d4 [ 17.635228] ksys_ioctl+0x50/0x80 [ 17.635237] __arm64_sys_ioctl+0x28/0x38 [ 17.635255] el0_svc_common.constprop.0+0xe8/0x168 [ 17.635267] el0_svc_handler+0x70/0x8c [ 17.635282] el0_svc+0x8/0xc Change-Id: I95f6445ff5008c3505ad0cc68b2d005a196cd881 Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.