Patch "cachefiles: fix memory leak in cachefiles_add_cache()" has been added to the 6.1-stable tree

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This is a note to let you know that I've just added the patch titled

    cachefiles: fix memory leak in cachefiles_add_cache()

to the 6.1-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:
     cachefiles-fix-memory-leak-in-cachefiles_add_cache.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From e21a2f17566cbd64926fb8f16323972f7a064444 Mon Sep 17 00:00:00 2001
From: Baokun Li <libaokun1@xxxxxxxxxx>
Date: Sat, 17 Feb 2024 16:14:31 +0800
Subject: cachefiles: fix memory leak in cachefiles_add_cache()

From: Baokun Li <libaokun1@xxxxxxxxxx>

commit e21a2f17566cbd64926fb8f16323972f7a064444 upstream.

The following memory leak was reported after unbinding /dev/cachefiles:

==================================================================
unreferenced object 0xffff9b674176e3c0 (size 192):
  comm "cachefilesd2", pid 680, jiffies 4294881224
  hex dump (first 32 bytes):
    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc ea38a44b):
    [<ffffffff8eb8a1a5>] kmem_cache_alloc+0x2d5/0x370
    [<ffffffff8e917f86>] prepare_creds+0x26/0x2e0
    [<ffffffffc002eeef>] cachefiles_determine_cache_security+0x1f/0x120
    [<ffffffffc00243ec>] cachefiles_add_cache+0x13c/0x3a0
    [<ffffffffc0025216>] cachefiles_daemon_write+0x146/0x1c0
    [<ffffffff8ebc4a3b>] vfs_write+0xcb/0x520
    [<ffffffff8ebc5069>] ksys_write+0x69/0xf0
    [<ffffffff8f6d4662>] do_syscall_64+0x72/0x140
    [<ffffffff8f8000aa>] entry_SYSCALL_64_after_hwframe+0x6e/0x76
==================================================================

Put the reference count of cache_cred in cachefiles_daemon_unbind() to
fix the problem. And also put cache_cred in cachefiles_add_cache() error
branch to avoid memory leaks.

Fixes: 9ae326a69004 ("CacheFiles: A cache that backs onto a mounted filesystem")
CC: stable@xxxxxxxxxxxxxxx
Signed-off-by: Baokun Li <libaokun1@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240217081431.796809-1-libaokun1@xxxxxxxxxx
Acked-by: David Howells <dhowells@xxxxxxxxxx>
Reviewed-by: Jingbo Xu <jefflexu@xxxxxxxxxxxxxxxxx>
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/cachefiles/cache.c  |    2 ++
 fs/cachefiles/daemon.c |    1 +
 2 files changed, 3 insertions(+)

--- a/fs/cachefiles/cache.c
+++ b/fs/cachefiles/cache.c
@@ -168,6 +168,8 @@ error_unsupported:
 	dput(root);
 error_open_root:
 	cachefiles_end_secure(cache, saved_cred);
+	put_cred(cache->cache_cred);
+	cache->cache_cred = NULL;
 error_getsec:
 	fscache_relinquish_cache(cache_cookie);
 	cache->cache = NULL;
--- a/fs/cachefiles/daemon.c
+++ b/fs/cachefiles/daemon.c
@@ -805,6 +805,7 @@ static void cachefiles_daemon_unbind(str
 	cachefiles_put_directory(cache->graveyard);
 	cachefiles_put_directory(cache->store);
 	mntput(cache->mnt);
+	put_cred(cache->cache_cred);
 
 	kfree(cache->rootdirname);
 	kfree(cache->secctx);


Patches currently in stable-queue which might be from libaokun1@xxxxxxxxxx are

queue-6.1/cachefiles-fix-memory-leak-in-cachefiles_add_cache.patch
queue-6.1/ext4-avoid-dividing-by-0-in-mb_update_avg_fragment_s.patch
queue-6.1/ext4-avoid-allocating-blocks-from-corrupted-group-in.patch
queue-6.1/ext4-avoid-allocating-blocks-from-corrupted-group-in.patch-21683




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