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fuse: check size of FUSE_NOTIFY_INVAL_ENTRY message

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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
This commit is contained in:
Miklos Szeredi 2011-08-24 10:20:17 +02:00
parent 478e0841b3
commit c2183d1e9b
1 changed files with 4 additions and 0 deletions
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4
fs/fuse/dev.c
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@ -1358,6 +1358,10 @@ static int fuse_notify_inval_entry(struct fuse_conn *fc, unsigned int size,
if (outarg.namelen > FUSE_NAME_MAX) if (outarg.namelen > FUSE_NAME_MAX)
goto err; goto err;
err = -EINVAL;
if (size != sizeof(outarg) + outarg.namelen + 1)
goto err;
name.name = buf; name.name = buf;
name.len = outarg.namelen; name.len = outarg.namelen;
err = fuse_copy_one(cs, buf, outarg.namelen + 1); err = fuse_copy_one(cs, buf, outarg.namelen + 1);