linux-kernel - Re: [PATCH v2 1/1] pidfs: Fix memory leak in pidfd

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Message-ID: <20250815-avocado-schalldicht-f3c2c0720bcc@brauner>
Date: Fri, 15 Aug 2025 16:11:00 +0200
From: Christian Brauner <brauner@...nel.org>
To: "Adrian Huang (Lenovo)" <adrianhuang0701@...il.com>
Cc: Christian Brauner <brauner@...nel.org>,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	ahuang12@...ovo.com,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Jan Kara <jack@...e.cz>
Subject: Re: [PATCH v2 1/1] pidfs: Fix memory leak in pidfd_info()

On Thu, 14 Aug 2025 17:44:53 +0800, Adrian Huang (Lenovo) wrote:
> After running the program 'ioctl_pidfd03' of Linux Test Project (LTP) or
> the program 'pidfd_info_test' in 'tools/testing/selftests/pidfd' of the
> kernel source, kmemleak reports the following memory leaks:
> 
>   # cat /sys/kernel/debug/kmemleak
>   unreferenced object 0xff110020e5988000 (size 8216):
>     comm "ioctl_pidfd03", pid 10853, jiffies 4294800031
>     hex dump (first 32 bytes):
>       02 40 00 00 00 00 00 00 10 00 00 00 00 00 00 00  .@..............
>       00 00 00 00 af 01 00 00 80 00 00 00 00 00 00 00  ................
>     backtrace (crc 69483047):
>       kmem_cache_alloc_node_noprof+0x2fb/0x410
>       copy_process+0x178/0x1740
>       kernel_clone+0x99/0x3b0
>       __do_sys_clone3+0xbe/0x100
>       do_syscall_64+0x7b/0x2c0
>       entry_SYSCALL_64_after_hwframe+0x76/0x7e
>   ...
>   unreferenced object 0xff11002097b70000 (size 8216):
>   comm "pidfd_info_test", pid 11840, jiffies 4294889165
>   hex dump (first 32 bytes):
>     06 40 00 00 00 00 00 00 10 00 00 00 00 00 00 00  .@..............
>     00 00 00 00 b5 00 00 00 80 00 00 00 00 00 00 00  ................
>   backtrace (crc a6286bb7):
>     kmem_cache_alloc_node_noprof+0x2fb/0x410
>     copy_process+0x178/0x1740
>     kernel_clone+0x99/0x3b0
>     __do_sys_clone3+0xbe/0x100
>     do_syscall_64+0x7b/0x2c0
>     entry_SYSCALL_64_after_hwframe+0x76/0x7e
>   ...
> 
> [...]

Applied to the vfs.fixes branch of the vfs/vfs.git tree.
Patches in the vfs.fixes branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs.fixes

[1/1] pidfs: Fix memory leak in pidfd_info()
      https://git.kernel.org/vfs/vfs/c/0b2d71a7c826