This is a note to let you know that I've just added the patch titled
ovl: drop WARN_ON() dentry is NULL in ovl_encode_fh()
to the 5.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ovl-drop-warn_on-dentry-is-null-in-ovl_encode_fh.patch
and it can be found in the queue-5.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From dd524b7f317de8d31d638cbfdc7be4cf9b770e42 Mon Sep 17 00:00:00 2001
From: Jiachen Zhang <zhangjiachen.jaycee@xxxxxxxxxxxxx>
Date: Thu, 28 Jul 2022 19:49:15 +0800
Subject: ovl: drop WARN_ON() dentry is NULL in ovl_encode_fh()
From: Jiachen Zhang <zhangjiachen.jaycee@xxxxxxxxxxxxx>
commit dd524b7f317de8d31d638cbfdc7be4cf9b770e42 upstream.
Some code paths cannot guarantee the inode have any dentry alias. So
WARN_ON() all !dentry may flood the kernel logs.
For example, when an overlayfs inode is watched by inotifywait (1), and
someone is trying to read the /proc/$(pidof inotifywait)/fdinfo/INOTIFY_FD,
at that time if the dentry has been reclaimed by kernel (such as
echo 2 > /proc/sys/vm/drop_caches), there will be a WARN_ON(). The
printed call stack would be like:
? show_mark_fhandle+0xf0/0xf0
show_mark_fhandle+0x4a/0xf0
? show_mark_fhandle+0xf0/0xf0
? seq_vprintf+0x30/0x50
? seq_printf+0x53/0x70
? show_mark_fhandle+0xf0/0xf0
inotify_fdinfo+0x70/0x90
show_fdinfo.isra.4+0x53/0x70
seq_show+0x130/0x170
seq_read+0x153/0x440
vfs_read+0x94/0x150
ksys_read+0x5f/0xe0
do_syscall_64+0x59/0x1e0
entry_SYSCALL_64_after_hwframe+0x44/0xa9
So let's drop WARN_ON() to avoid kernel log flooding.
Reported-by: Hongbo Yin <yinhongbo@xxxxxxxxxxxxx>
Signed-off-by: Jiachen Zhang <zhangjiachen.jaycee@xxxxxxxxxxxxx>
Signed-off-by: Tianci Zhang <zhangtianci.1997@xxxxxxxxxxxxx>
Fixes: 8ed5eec9d6c4 ("ovl: encode pure upper file handles")
Cc: <stable@xxxxxxxxxxxxxxx> # v4.16
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/overlayfs/export.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/overlayfs/export.c
+++ b/fs/overlayfs/export.c
@@ -259,7 +259,7 @@ static int ovl_encode_fh(struct inode *i
return FILEID_INVALID;
dentry = d_find_any_alias(inode);
- if (WARN_ON(!dentry))
+ if (!dentry)
return FILEID_INVALID;
bytes = ovl_dentry_to_fid(ofs, dentry, fid, buflen);
Patches currently in stable-queue which might be from zhangjiachen.jaycee@xxxxxxxxxxxxx are
queue-5.19/ovl-drop-warn_on-dentry-is-null-in-ovl_encode_fh.patch
