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Subject[18/19] fuse: check size of FUSE_NOTIFY_INVAL_ENTRY message
2.6.32-longterm review patch.  If anyone has any objections, please let us know.

------------------
From: Miklos Szeredi <mszeredi@suse.cz>

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>

---
fs/fuse/dev.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -899,6 +899,10 @@ static int fuse_notify_inval_entry(struc
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);



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