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Tianyang Zhang 985f086f28 LoongArch: Fix panic caused by NULL-PMD in huge_pte_offset() 
commit ee084fa961 upstream.

ERROR INFO:

CPU 25 Unable to handle kernel paging request at virtual address 0x0
         ...
 Call Trace:
 [<900000000023c30c>] huge_pte_offset+0x3c/0x58
 [<900000000057fd4c>] hugetlb_follow_page_mask+0x74/0x438
 [<900000000051fee8>] __get_user_pages+0xe0/0x4c8
 [<9000000000522414>] faultin_page_range+0x84/0x380
 [<9000000000564e8c>] madvise_vma_behavior+0x534/0xa48
 [<900000000056689c>] do_madvise+0x1bc/0x3e8
 [<9000000000566df4>] sys_madvise+0x24/0x38
 [<90000000015b9e88>] do_syscall+0x78/0x98
 [<9000000000221f18>] handle_syscall+0xb8/0x158

In some cases, pmd may be NULL and rely on NULL as the return value for
processing, so it is necessary to determine this situation here.

Cc: stable@vger.kernel.org
Fixes: bd51834d1c ("LoongArch: Return NULL from huge_pte_offset() for invalid PMD")
Signed-off-by: Tianyang Zhang <zhangtianyang@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2025-06-27 11:11:37 +01:00
arch LoongArch: Fix panic caused by NULL-PMD in huge_pte_offset() 2025-06-27 11:11:37 +01:00
block block: Clear BIO_EMULATES_ZONE_APPEND flag on BIO completion 2025-06-27 11:11:19 +01:00
certs
crypto crypto: api - Redo lookup on EEXIST 2025-06-19 15:31:30 +02:00
Documentation regulator: dt-bindings: mt6357: Drop fixed compatible requirement 2025-06-19 15:32:37 +02:00
drivers platform/loongarch: laptop: Add backlight power control support 2025-06-27 11:11:37 +01:00
fs fs/xattr.c: fix simple_xattr_list() 2025-06-27 11:11:36 +01:00
include Revert "mac80211: Dynamically set CoDel parameters per station" 2025-06-27 11:11:33 +01:00
init rust: clean Rust 1.88.0's unnecessary_transmutes lint 2025-05-18 08:24:51 +02:00
io_uring io_uring: fix task leak issue in io_wq_create() 2025-06-27 11:11:36 +01:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:11:22 +01:00
kernel bpf: Use proper type to calculate bpf_raw_tp_null_args.mask index 2025-06-27 11:11:33 +01:00
lib iov_iter: use iov_offset for length calculation in iov_iter_aligned_bvec 2025-06-19 15:32:21 +02:00
LICENSES
mm mm/hugetlb: fix huge_pmd_unshare() vs GUP-fast race 2025-06-27 11:11:26 +01:00
net bpf, sockmap: Fix data lost during EAGAIN retries 2025-06-27 11:11:35 +01:00
rust rust: alloc: add missing invariant in Vec::set_len() 2025-06-19 15:32:09 +02:00
samples samples/bpf: Fix compilation failure for samples/bpf on LoongArch Fedora 2025-05-29 11:02:01 +02:00
scripts Make 'cc-option' work correctly for the -Wno-xyzzy pattern 2025-06-27 11:11:27 +01:00
security smack: Revert "smackfs: Added check catlen" 2025-05-29 11:02:48 +02:00
sound ASoC: tegra210_ahub: Add check to of_device_get_match_data() 2025-06-27 11:11:27 +01:00
tools libbpf: Add identical pointer detection to btf_dedup_is_equiv() 2025-06-27 11:11:32 +01:00
usr
virt KVM: Add member to struct kvm_gfn_range to indicate private/shared 2025-05-22 14:29:36 +02:00
.clang-format
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-18 08:24:51 +02:00
.cocciconfig
.editorconfig
.get_maintainer.ignore
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.rustfmt.toml
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MAINTAINERS MAINTAINERS: Update Alexey Makhalov's email address 2025-05-22 14:29:46 +02:00
Makefile Linux 6.12.34 2025-06-19 15:32:38 +02:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
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Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
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    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.