[XFS] fix NULL pointer dereference in pagebuf

SGI Modid: 2.5.x-xfs:slinx:130709a

[XFS] fix NULL pointer dereference in pagebuf
SGI Modid: 2.5.x-xfs:slinx:130709a
ea791101 · Christoph Hellwig · Nathan Scott · 272ce1b4 · ea791101
Commit ea791101 authored Nov 06, 2002 by Christoph Hellwig Committed by Nathan Scott Nov 06, 2002
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fs/xfs/pagebuf/page_buf.c fs/xfs/pagebuf/page_buf.c +2 -1

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--- a/fs/xfs/pagebuf/page_buf.c
+++ b/fs/xfs/pagebuf/page_buf.c
@@ -571,7 +571,8 @@ _pagebuf_lookup_pages(

 	if (!pb->pb_locked) {
 		for (pi = 0; pi < page_count; pi++) {
-			unlock_page(pb->pb_pages[pi]);
+			if (pb->pb_pages[pi])
+				unlock_page(pb->pb_pages[pi]);
 		}
 	}