fix page release issue in filemap_fault

find_lock_page increases page's usage count, we should decrease it
before return VM_FAULT_SIGBUS

Signed-off-by: Yan Zheng<yanzheng@21cn.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/filemap.c b/mm/filemap.c
index 90b657b..15c8413 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1388,6 +1388,7 @@ retry_find:
        size = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
        if (unlikely(vmf->pgoff >= size)) {
                unlock_page(page);
+               page_cache_release(page);
                goto outside_data_content;
        }