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Edward Adam Davis 48c1734157 cifs: client: fix memory leak in smb3_fs_context_parse_param 
commit e8c73eb7db upstream.

The user calls fsconfig twice, but when the program exits, free() only
frees ctx->source for the second fsconfig, not the first.
Regarding fc->source, there is no code in the fs context related to its
memory reclamation.

To fix this memory leak, release the source memory corresponding to ctx
or fc before each parsing.

syzbot reported:
BUG: memory leak
unreferenced object 0xffff888128afa360 (size 96):
  backtrace (crc 79c9c7ba):
    kstrdup+0x3c/0x80 mm/util.c:84
    smb3_fs_context_parse_param+0x229b/0x36c0 fs/smb/client/fs_context.c:1444

BUG: memory leak
unreferenced object 0xffff888112c7d900 (size 96):
  backtrace (crc 79c9c7ba):
    smb3_fs_context_fullpath+0x70/0x1b0 fs/smb/client/fs_context.c:629
    smb3_fs_context_parse_param+0x2266/0x36c0 fs/smb/client/fs_context.c:1438

Reported-by: syzbot+72afd4c236e6bc3f4bac@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=72afd4c236e6bc3f4bac
Cc: stable@vger.kernel.org
Reviewed-by: Paulo Alcantara (Red Hat) <pc@manguebit.org>
Signed-off-by: Edward Adam Davis <eadavis@qq.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-11-24 10:36:01 +01:00
arch LoongArch: Let {pte,pmd}_modify() record the status of _PAGE_DIRTY 2025-11-24 10:36:00 +01:00
block blk-cgroup: fix possible deadlock while configuring policy 2025-11-13 15:34:07 -05:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: essiv - Check ssize for decryption and in-place encryption 2025-10-19 16:33:42 +02:00
Documentation dpll: spec: add missing module-name and clock-id to pin-get reply 2025-11-13 15:33:59 -05:00
drivers mmc: dw_mmc-rockchip: Fix wrong internal phase calculate 2025-11-24 10:36:01 +01:00
fs cifs: client: fix memory leak in smb3_fs_context_parse_param 2025-11-24 10:36:01 +01:00
include dma-mapping: benchmark: Restore padding to ensure uABI remained consistent 2025-11-24 10:35:59 +01:00
init init: handle bootloader identifier in kernel parameters 2025-10-19 16:33:50 +02:00
io_uring io_uring/zctx: check chained notif contexts 2025-11-13 15:34:03 -05:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:11:22 +01:00
kernel gcov: add support for GCC 15 2025-11-24 10:35:59 +01:00
lib lib/crypto: curve25519-hacl64: Fix older clang KASAN workaround for GCC 2025-11-13 15:34:40 -05:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm mm/shmem: fix THP allocation and fallback loop 2025-11-24 10:36:01 +01:00
net wifi: mac80211: reject address change while connecting 2025-11-24 10:36:00 +01:00
rust rust: Add -fno-isolate-erroneous-paths-dereference to bindgen_skip_c_flags 2025-11-24 10:35:49 +01:00
samples ftrace/samples: Fix function size computation 2025-09-19 16:35:44 +02:00
scripts gcc-plugins: Remove TODO_verify_il for GCC >= 16 2025-10-06 11:17:52 +02:00
security ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr 2025-11-13 15:34:32 -05:00
sound ALSA: usb-audio: Fix potential overflow of PCM transfer buffer 2025-11-24 10:36:01 +01:00
tools selftests/tracing: Run sample events to clear page cache events 2025-11-24 10:36:00 +01:00
usr kbuild: uapi: Strip comments before size type check 2025-11-13 15:34:35 -05:00
virt KVM: Allow CPU to reschedule while setting per-page memory attributes 2025-07-17 18:37:08 +02:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +02:00
.clippy.toml rust: give Clippy the minimum supported Rust version 2025-08-01 09:48:44 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore rust: introduce .clippy.toml 2025-03-13 13:01:42 +01:00
.mailmap mailmap: add entry for Thorsten Blum 2024-11-07 14:14:59 -08:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Remove self from DSA entry 2024-11-03 12:52:38 -08:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS MAINTAINERS: Update Alexey Makhalov's email address 2025-05-22 14:29:46 +02:00
Makefile Linux 6.12.58 2025-11-13 15:34:41 -05:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

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.