sysvfs: fix NULL deref. when allocating new inode

A call to sysv_write_inode() in sysv_new_inode() to its new interface that
replaced wait flag with writeback structure.  This was broken by
a9185b41a4f84971b930c519f0c63bd450c4810d ("pass writeback_control to
->write_inode").

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: <stable@kernel.org>		[2.6.34.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/sysv/ialloc.c b/fs/sysv/ialloc.c
index bbd69bdb0fa8cc9ccba41fec291fa13af43f796f..fcc498ec9b337afdcb96582fce07734c9a3cb46d 100644 (file)
--- a/fs/sysv/ialloc.c
+++ b/fs/sysv/ialloc.c
@@ -25,6 +25,7 @@
 #include <linux/stat.h>
 #include <linux/string.h>
 #include <linux/buffer_head.h>
+#include <linux/writeback.h>
 #include "sysv.h"
 
 /* We don't trust the value of
@@ -139,6 +140,9 @@ struct inode * sysv_new_inode(const struct inode * dir, mode_t mode)
        struct inode *inode;
        sysv_ino_t ino;
        unsigned count;
+       struct writeback_control wbc = {
+               .sync_mode = WB_SYNC_NONE
+       };
 
        inode = new_inode(sb);
        if (!inode)
@@ -168,7 +172,7 @@ struct inode * sysv_new_inode(const struct inode * dir, mode_t mode)
        insert_inode_hash(inode);
        mark_inode_dirty(inode);
 
-       sysv_write_inode(inode, 0);     /* ensure inode not allocated again */
+       sysv_write_inode(inode, &wbc);  /* ensure inode not allocated again */
        mark_inode_dirty(inode);        /* cleared by sysv_write_inode() */
        /* That's it. */
        unlock_super(sb);