btrfs: Fix error handling in zlib
Return failure if alloc_page() fails to allocate memory,
and the upper code will just give up compression.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
diff --git a/fs/btrfs/zlib.c b/fs/btrfs/zlib.c
index e5b8b22..b015586 100644
--- a/fs/btrfs/zlib.c
+++ b/fs/btrfs/zlib.c
@@ -225,6 +225,10 @@
data_in = kmap(in_page);
out_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
+ if (out_page == NULL) {
+ ret = -1;
+ goto out;
+ }
cpage_out = kmap(out_page);
pages[0] = out_page;
nr_pages = 1;
@@ -263,6 +267,10 @@
goto out;
}
out_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
+ if (out_page == NULL) {
+ ret = -1;
+ goto out;
+ }
cpage_out = kmap(out_page);
pages[nr_pages] = out_page;
nr_pages++;