From: David Howells dhowells@redhat.com
This patch has been added to the stable tree. If you have any objections, please let us know.
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[ 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@microsoft.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 cc46e8c1d46e..d89595155ec9 100644 --- a/fs/afs/write.c +++ b/fs/afs/write.c @@ -148,12 +148,12 @@ 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; @@ -161,6 +161,9 @@ 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);