0f6b1bdbec
[ Upstream commit 2455d417c03aa0cbafed04c46cbb354643238318 ] If v4l2_m2m_init() fails, m2m_dev pointer will be set ERR_PTR(-ENOMEM), then kfree m2m_dev will trigger BUG_ON, see below, fix it by setting m2m_dev to NULL. vim2m vim2m.0: Failed to init mem2mem device ------------[ cut here ]------------ kernel BUG at mm/slub.c:3944! invalid opcode: 0000 [#1] SMP PTI CPU: 11 PID: 9061 Comm: insmod Tainted: G E 5.2.0-rc2 #81 Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011 RIP: 0010:kfree+0x11a/0x160 Call Trace: vim2m_device_release+0x3f/0x50 [vim2m] device_release+0x27/0x80 kobject_release+0x68/0x190 vim2m_probe+0x20f/0x280 [vim2m] platform_drv_probe+0x37/0x90 really_probe+0xef/0x3d0 driver_probe_device+0x110/0x120 device_driver_attach+0x4f/0x60 __driver_attach+0x9a/0x140 ? device_driver_attach+0x60/0x60 bus_for_each_dev+0x76/0xc0 ? klist_add_tail+0x57/0x70 bus_add_driver+0x141/0x210 driver_register+0x5b/0xe0 vim2m_init+0x29/0x1000 [vim2m] do_one_initcall+0x46/0x1f4 ? __slab_alloc+0x1c/0x30 ? kmem_cache_alloc_trace+0x167/0x1b0 do_init_module+0x5b/0x21f load_module+0x1add/0x1fb0 ? __do_sys_finit_module+0xe9/0x110 __do_sys_finit_module+0xe9/0x110 do_syscall_64+0x5b/0x1c0 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Fixes: ea6c7e34f3b2 ("media: vim2m: replace devm_kzalloc by kzalloc") Reported-by: Hulk Robot <hulkci@huawei.com> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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.
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.