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fuse: fix leaked notify reply

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commit 7fabaf3034 upstream.

fuse_request_send_notify_reply() may fail if the connection was reset for
some reason (e.g. fs was unmounted).  Don't leak request reference in this
case.  Besides leaking memory, this resulted in fc->num_waiting not being
decremented and hence fuse_wait_aborted() left in a hanging and unkillable
state.

Fixes: 2d45ba381a ("fuse: add retrieve request")
Fixes: b8f95e5d13 ("fuse: umount should wait for all requests")
Reported-and-tested-by: syzbot+6339eda9cb4ebbc4c37b@syzkaller.appspotmail.com
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Cc: <stable@vger.kernel.org> #v2.6.36
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Miklos Szeredi 2018-11-09 15:52:16 +01:00 committed by Greg Kroah-Hartman
parent 453e01cc6d
commit 6023d16fdb
1 changed files with 3 additions and 1 deletions
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4
fs/fuse/dev.c
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@ -1771,8 +1771,10 @@ static int fuse_retrieve(struct fuse_conn *fc, struct inode *inode,
req->in.args[1].size = total_len;
err = fuse_request_send_notify_reply(fc, req, outarg->notify_unique);
if (err)
if (err) {
fuse_retrieve_end(fc, req);
fuse_put_request(fc, req);
}
return err;
}