Commit c2183d1e authored Aug 24, 2011 by Miklos Szeredi

fuse: check size of FUSE_NOTIFY_INVAL_ENTRY message



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>
CC: stable@kernel.org

parent 478e0841

fs/fuse/dev.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -1358,6 +1358,10 @@ 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);