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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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Geert Uytterhoeven
c97a2a726c
[ Upstream commite5b78f2e34] If iommu_ops.add_device() fails, iommu_ops.domain_free() is still called, leading to a crash, as the domain was only partially initialized: ipmmu-vmsa e67b0000.mmu: Cannot accommodate DMA translation for IOMMU page tables sata_rcar ee300000.sata: Unable to initialize IPMMU context iommu: Failed to add device ee300000.sata to group 0: -22 Unable to handle kernel NULL pointer dereference at virtual address 0000000000000038 ... Call trace: ipmmu_domain_free+0x1c/0xa0 iommu_group_release+0x48/0x68 kobject_put+0x74/0xe8 kobject_del.part.0+0x3c/0x50 kobject_put+0x60/0xe8 iommu_group_get_for_dev+0xa8/0x1f0 ipmmu_add_device+0x1c/0x40 of_iommu_configure+0x118/0x190 Fix this by checking if the domain's context already exists, before trying to destroy it. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Robin Murphy <robin.murphy@arm.com> Fixes:d25a2a16f0('iommu: Add driver for Renesas VMSA-compatible IPMMU') Signed-off-by: Joerg Roedel <jroedel@suse.de> 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.
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.