From 0b55eccde1145e8e2b31fe855cdba3987676beb8 Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Wed, 24 Aug 2011 10:20:17 +0200 Subject: [PATCH] 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 Signed-off-by: Miklos Szeredi Signed-off-by: Paul Gortmaker --- fs/fuse/dev.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c index c235afc698a0..9897fe338818 100644 --- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -901,6 +901,10 @@ 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); -- 2.39.5