fuse: check size of FUSE_NOTIFY_INVAL_ENTRY message

commit c2183d1e9b3f313dd8ba2b1b0197c8d9fb86a7ae upstream.

FUSE_NOTIFY_INVAL_ENTRY didn't check the length of the write so the
message processing could overrun and result in a "kernel BUG at
fs/fuse/dev.c:629!"

Reported-by: Han-Wen Nienhuys <hanwenn@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 51d9e33d634f4fb40f28fc00276123e1dc8f13c0..5cbeb74854fdec273ec10be0216b945ea79fd815 100644 (file)
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -899,6 +899,10 @@ static int fuse_notify_inval_entry(struct fuse_conn *fc, unsigned int size,
        if (outarg.namelen > FUSE_NAME_MAX)
                goto err;
 
+       err = -EINVAL;
+       if (size != sizeof(outarg) + outarg.namelen + 1)
+               goto err;
+
        name.name = buf;
        name.len = outarg.namelen;
        err = fuse_copy_one(cs, buf, outarg.namelen + 1);