lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Mon, 18 Feb 2019 14:43:10 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Anatoly Trosinenko <anatoly.trosinenko@...il.com>, "J. Bruce Fields" <bfields@...hat.com>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 3.18 014/108] nfsd4: fix crash on writing v4_end_grace before nfsd startup 3.18-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit 62a063b8e7d1db684db3f207261a466fa3194e72 ] Anatoly Trosinenko reports that this: 1) Checkout fresh master Linux branch (tested with commit e195ca6cb) 2) Copy x84_64-config-4.14 to .config, then enable NFS server v4 and build 3) From `kvm-xfstests shell`: results in NULL dereference in locks_end_grace. Check that nfsd has been started before trying to end the grace period. Reported-by: Anatoly Trosinenko <anatoly.trosinenko@...il.com> Signed-off-by: J. Bruce Fields <bfields@...hat.com> Signed-off-by: Sasha Levin <sashal@...nel.org> --- fs/nfsd/nfsctl.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c index ca73ca79a0ee..0e8574af298b 100644 --- a/fs/nfsd/nfsctl.c +++ b/fs/nfsd/nfsctl.c @@ -1110,6 +1110,8 @@ static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size) case 'Y': case 'y': case '1': + if (nn->nfsd_serv) + return -EBUSY; nfsd4_end_grace(nn); break; default: -- 2.19.1
Powered by blists - more mailing lists