From 1c32348d15cf68985e3904b268e5929abc232415 Mon Sep 17 00:00:00 2001
From: green <green>
Date: Sat, 11 Aug 2007 22:58:56 +0000
Subject: [PATCH] b=13276 r=wangdi,shadow.

Check return value of ll_node_from_inode in ll_file_read and ll_file_sendfile,
do not dereference uninitialised lock tree in ll_file_write.
---
 lustre/llite/file.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/lustre/llite/file.c b/lustre/llite/file.c
index 3178517..87f7f1e 100644
--- a/lustre/llite/file.c
+++ b/lustre/llite/file.c
@@ -1224,6 +1224,10 @@ repeat:
         }
        
         node = ll_node_from_inode(inode, *ppos, end, LCK_PR);
+        if (IS_ERR(node)){
+                GOTO(out, rc = PTR_ERR(node));
+        }
+
         tree.lt_fd = LUSTRE_FPRIVATE(file);
         rc = ll_tree_lock(&tree, node, buf, count,
                           file->f_flags & O_NONBLOCK ? LDLM_FL_BLOCK_NOWAIT :0);
@@ -1398,7 +1402,7 @@ repeat:
 
         if (*ppos >= maxbytes) {
                 send_sig(SIGXFSZ, current, 0);
-                GOTO(out, retval = -EFBIG);
+                GOTO(out_unlock, retval = -EFBIG);
         }
         if (*ppos + count > maxbytes)
                 count = maxbytes - *ppos;
@@ -1410,9 +1414,10 @@ repeat:
         retval = generic_file_write(file, buf, chunk, ppos);
         ll_rw_stats_tally(ll_i2sbi(inode), current->pid, file, count, 1);
 
-out:
+out_unlock:
         ll_tree_unlock(&tree);
 
+out:
         if (retval > 0) {
                 buf += retval;
                 count -= retval;
@@ -1464,6 +1469,9 @@ static ssize_t ll_file_sendfile(struct file *in_file, loff_t *ppos,size_t count,
                 RETURN(generic_file_sendfile(in_file, ppos, count, actor, target));
 
         node = ll_node_from_inode(inode, *ppos, *ppos + count - 1, LCK_PR);
+        if (IS_ERR(node))
+                RETURN(PTR_ERR(node));
+
         tree.lt_fd = LUSTRE_FPRIVATE(in_file);
         rc = ll_tree_lock(&tree, node, NULL, count,
                           in_file->f_flags & O_NONBLOCK?LDLM_FL_BLOCK_NOWAIT:0);
-- 
1.8.3.1