This is a note to let you know that I've just added the patch titled
afs: Fix page leak in afs_write_begin()
to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: afs-fix-page-leak-in-afs_write_begin.patch and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Mon Dec 18 14:47:43 CET 2017
From: David Howells dhowells@redhat.com Date: Thu, 16 Mar 2017 16:27:48 +0000 Subject: afs: Fix page leak in afs_write_begin()
From: David Howells dhowells@redhat.com
[ Upstream commit 6d06b0d25209c80e99c1e89700f1e09694a3766b ]
afs_write_begin() leaks a ref and a lock on a page if afs_fill_page() fails. Fix the leak by unlocking and releasing the page in the error path.
Signed-off-by: David Howells dhowells@redhat.com Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/afs/write.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
--- a/fs/afs/write.c +++ b/fs/afs/write.c @@ -148,12 +148,12 @@ int afs_write_begin(struct file *file, s kfree(candidate); return -ENOMEM; } - *pagep = page; - /* page won't leak in error case: it eventually gets cleaned off LRU */
if (!PageUptodate(page) && len != PAGE_CACHE_SIZE) { ret = afs_fill_page(vnode, key, index << PAGE_CACHE_SHIFT, page); if (ret < 0) { + unlock_page(page); + put_page(page); kfree(candidate); _leave(" = %d [prep]", ret); return ret; @@ -161,6 +161,9 @@ int afs_write_begin(struct file *file, s SetPageUptodate(page); }
+ /* page won't leak in error case: it eventually gets cleaned off LRU */ + *pagep = page; + try_again: spin_lock(&vnode->writeback_lock);
Patches currently in stable-queue which might be from dhowells@redhat.com are
queue-4.4/afs-flush-outstanding-writes-when-an-fd-is-closed.patch queue-4.4/afs-fix-the-maths-in-afs_fs_store_data.patch queue-4.4/afs-populate-group-id-from-vnode-status.patch queue-4.4/afs-prevent-callback-expiry-timer-overflow.patch queue-4.4/keys-add-missing-permission-check-for-request_key-destination.patch queue-4.4/afs-adjust-mode-bits-processing.patch queue-4.4/afs-fix-page-leak-in-afs_write_begin.patch queue-4.4/afs-fix-missing-put_page.patch queue-4.4/afs-migrate-vlocation-fields-to-64-bit.patch queue-4.4/afs-populate-and-use-client-modification-time.patch queue-4.4/afs-fix-afs_kill_pages.patch