Messages in this thread Patch in this message | | | From | alexander.levin@verizon ... | Subject | [PATCH AUTOSEL for 3.18 21/59] afs: Fix page leak in afs_write_begin() | Date | Thu, 7 Dec 2017 15:51:27 +0000 |
| |
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> --- fs/afs/write.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/fs/afs/write.c b/fs/afs/write.c index 24f11d2deeb2..9f816624e212 100644 --- a/fs/afs/write.c +++ b/fs/afs/write.c @@ -149,12 +149,12 @@ int afs_write_begin(struct file *file, struct address_space *mapping, 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; @@ -162,6 +162,9 @@ int afs_write_begin(struct file *file, struct address_space *mapping, SetPageUptodate(page); } + /* page won't leak in error case: it eventually gets cleaned off LRU */ + *pagep = page; + try_again: spin_lock(&vnode->writeback_lock); -- 2.11.0
| |