From ab49bdecc3ebb46ab661f5f05d5c5ea9606406c6 Mon Sep 17 00:00:00 2001 From: Cyrill Gorcunov Date: Mon, 17 Dec 2012 16:05:06 -0800 Subject: [PATCH] fs, exportfs: escape nil dereference if no s_export_op present This routine will be used to generate a file handle in fdinfo output for inotify subsystem, where if no s_export_op present the general export_encode_fh should be used. Thus add a test if s_export_op present inside exportfs_encode_fh itself. Signed-off-by: Cyrill Gorcunov Acked-by: Pavel Emelyanov Cc: Oleg Nesterov Cc: Andrey Vagin Cc: Al Viro Cc: Alexey Dobriyan Cc: James Bottomley Cc: "Aneesh Kumar K.V" Cc: Alexey Dobriyan Cc: Matthew Helsley Cc: "J. Bruce Fields" Cc: "Aneesh Kumar K.V" Cc: Tvrtko Ursulin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/exportfs/expfs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c index 29ab099e3e08..10f137381ac7 100644 --- a/fs/exportfs/expfs.c +++ b/fs/exportfs/expfs.c @@ -357,7 +357,7 @@ int exportfs_encode_fh(struct dentry *dentry, struct fid *fid, int *max_len, */ parent = p->d_inode; } - if (nop->encode_fh) + if (nop && nop->encode_fh) error = nop->encode_fh(inode, fid->raw, max_len, parent); else error = export_encode_fh(inode, fid, max_len, parent); -- 2.20.1