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Linux kernel source tree
36684e9d88
The pointer need to be set to NULL, otherwise KASAN complains about
use-after-free. Because in mtk_drm_bind, all private's drm are set
as follows.
private->all_drm_private[i]->drm = drm;
And drm will be released by drm_dev_put in case mtk_drm_kms_init returns
failure. However, the shutdown path still accesses the previous allocated
memory in drm_atomic_helper_shutdown.
[ 84.874820] watchdog: watchdog0: watchdog did not stop!
[ 86.512054] ==================================================================
[ 86.513162] BUG: KASAN: use-after-free in drm_atomic_helper_shutdown+0x33c/0x378
[ 86.514258] Read of size 8 at addr ffff0000d46fc068 by task shutdown/1
[ 86.515213]
[ 86.515455] CPU: 1 UID: 0 PID: 1 Comm: shutdown Not tainted 6.13.0-rc1-mtk+gfa1a78e5d24b-dirty #55
[ 86.516752] Hardware name: Unknown Product/Unknown Product, BIOS 2022.10 10/01/2022
[ 86.517960] Call trace:
[ 86.518333] show_stack+0x20/0x38 (C)
[ 86.518891] dump_stack_lvl+0x90/0xd0
[ 86.519443] print_report+0xf8/0x5b0
[ 86.519985] kasan_report+0xb4/0x100
[ 86.520526] __asan_report_load8_noabort+0x20/0x30
[ 86.521240] drm_atomic_helper_shutdown+0x33c/0x378
[ 86.521966] mtk_drm_shutdown+0x54/0x80
[ 86.522546] platform_shutdown+0x64/0x90
[ 86.523137] device_shutdown+0x260/0x5b8
[ 86.523728] kernel_restart+0x78/0xf0
[ 86.524282] __do_sys_reboot+0x258/0x2f0
[ 86.524871] __arm64_sys_reboot+0x90/0xd8
[ 86.525473] invoke_syscall+0x74/0x268
[ 86.526041] el0_svc_common.constprop.0+0xb0/0x240
[ 86.526751] do_el0_svc+0x4c/0x70
[ 86.527251] el0_svc+0x4c/0xc0
[ 86.527719] el0t_64_sync_handler+0x144/0x168
[ 86.528367] el0t_64_sync+0x198/0x1a0
[ 86.528920]
[ 86.529157] The buggy address belongs to the physical page:
[ 86.529972] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff0000d46fd4d0 pfn:0x1146fc
[ 86.531319] flags: 0xbfffc0000000000(node=0|zone=2|lastcpupid=0xffff)
[ 86.532267] raw: 0bfffc0000000000 0000000000000000 dead000000000122 0000000000000000
[ 86.533390] raw: ffff0000d46fd4d0 0000000000000000 00000000ffffffff 0000000000000000
[ 86.534511] page dumped because: kasan: bad access detected
[ 86.535323]
[ 86.535559] Memory state around the buggy address:
[ 86.536265] ffff0000d46fbf00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 86.537314] ffff0000d46fbf80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 86.538363] >ffff0000d46fc000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 86.544733] ^
[ 86.551057] ffff0000d46fc080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 86.557510] ffff0000d46fc100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 86.563928] ==================================================================
[ 86.571093] Disabling lock debugging due to kernel taint
[ 86.577642] Unable to handle kernel paging request at virtual address e0e9c0920000000b
[ 86.581834] KASAN: maybe wild-memory-access in range [0x0752049000000058-0x075204900000005f]
...
Fixes:
|
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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 reStructuredText markup notation.
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.