4.19-stable patches

added patches:
	cachefiles-fix-memory-leak-in-cachefiles_add_cache.patch

diff --git a/queue-4.19/cachefiles-fix-memory-leak-in-cachefiles_add_cache.patch b/queue-4.19/cachefiles-fix-memory-leak-in-cachefiles_add_cache.patch
new file mode 100644 (file)
index 0000000..81bcdeb
--- /dev/null
+++ b/queue-4.19/cachefiles-fix-memory-leak-in-cachefiles_add_cache.patch
@@ -0,0 +1,66 @@
+From e21a2f17566cbd64926fb8f16323972f7a064444 Mon Sep 17 00:00:00 2001
+From: Baokun Li <libaokun1@huawei.com>
+Date: Sat, 17 Feb 2024 16:14:31 +0800
+Subject: cachefiles: fix memory leak in cachefiles_add_cache()
+
+From: Baokun Li <libaokun1@huawei.com>
+
+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@vger.kernel.org
+Signed-off-by: Baokun Li <libaokun1@huawei.com>
+Link: https://lore.kernel.org/r/20240217081431.796809-1-libaokun1@huawei.com
+Acked-by: David Howells <dhowells@redhat.com>
+Reviewed-by: Jingbo Xu <jefflexu@linux.alibaba.com>
+Reviewed-by: Jeff Layton <jlayton@kernel.org>
+Signed-off-by: Christian Brauner <brauner@kernel.org>
+Signed-off-by: Baokun Li <libaokun1@huawei.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/cachefiles/bind.c |    3 +++
+ 1 file changed, 3 insertions(+)
+
+--- a/fs/cachefiles/bind.c
++++ b/fs/cachefiles/bind.c
+@@ -249,6 +249,8 @@ error_open_root:
+       kmem_cache_free(cachefiles_object_jar, fsdef);
+ error_root_object:
+       cachefiles_end_secure(cache, saved_cred);
++      put_cred(cache->cache_cred);
++      cache->cache_cred = NULL;
+       pr_err("Failed to register: %d\n", ret);
+       return ret;
+ }
+@@ -269,6 +271,7 @@ void cachefiles_daemon_unbind(struct cac
+ 
+       dput(cache->graveyard);
+       mntput(cache->mnt);
++      put_cred(cache->cache_cred);
+ 
+       kfree(cache->rootdirname);
+       kfree(cache->secctx);

diff --git a/queue-4.19/series b/queue-4.19/series
index fb40a88d3b271c5ad7626dfec7da4be6d0252179..78e157b7a235c008acd2aa12c3968320ca05cf9e 100644 (file)
--- a/queue-4.19/series
+++ b/queue-4.19/series
@@ -13,3 +13,4 @@ wifi-nl80211-reject-iftype-change-with-mesh-id-change.patch
 btrfs-dev-replace-properly-validate-device-names.patch
 mmc-core-fix-emmc-initialization-with-1-bit-bus-connection.patch
 fs-aio-make-io_cancel-generate-completions-again.patch
+cachefiles-fix-memory-leak-in-cachefiles_add_cache.patch