[PATCH] 9p: fix marshalling bug in tcreate with empty extension field

Signed-off-by: Russ Ross <russross@gmail.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/fs/9p/conv.c b/fs/9p/conv.c
index 1e89814..56d88c1 100644 (file)
--- a/fs/9p/conv.c
+++ b/fs/9p/conv.c
@@ -673,8 +673,10 @@ struct v9fs_fcall *v9fs_create_tcreate(u32 fid, char *name, u32 perm, u8 mode,
        struct cbuf *bufp = &buffer;
 
        size = 4 + 2 + strlen(name) + 4 + 1;    /* fid[4] name[s] perm[4] mode[1] */
-       if (extended && extension!=NULL)
-               size += 2 + strlen(extension);  /* extension[s] */
+       if (extended) {
+               size += 2 +                     /* extension[s] */
+                   (extension == NULL ? 0 : strlen(extension));
+       }
 
        fc = v9fs_create_common(bufp, size, TCREATE);
        if (IS_ERR(fc))