From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, "J. Bruce Fields" <bfields@redhat.com>,
Chuck Lever <chuck.lever@oracle.com>,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.4 04/28] rpc: fix NULL dereference on kmalloc failure
Date: Mon, 5 Apr 2021 10:53:38 +0200 [thread overview]
Message-ID: <20210405085017.157226595@linuxfoundation.org> (raw)
In-Reply-To: <20210405085017.012074144@linuxfoundation.org>
From: J. Bruce Fields <bfields@redhat.com>
[ Upstream commit 0ddc942394013f08992fc379ca04cffacbbe3dae ]
I think this is unlikely but possible:
svc_authenticate sets rq_authop and calls svcauth_gss_accept. The
kmalloc(sizeof(*svcdata), GFP_KERNEL) fails, leaving rq_auth_data NULL,
and returning SVC_DENIED.
This causes svc_process_common to go to err_bad_auth, and eventually
call svc_authorise. That calls ->release == svcauth_gss_release, which
tries to dereference rq_auth_data.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Link: https://lore.kernel.org/linux-nfs/3F1B347F-B809-478F-A1E9-0BE98E22B0F0@oracle.com/T/#t
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/sunrpc/auth_gss/svcauth_gss.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/net/sunrpc/auth_gss/svcauth_gss.c b/net/sunrpc/auth_gss/svcauth_gss.c
index 91263d6a103b..bb8b0ef5de82 100644
--- a/net/sunrpc/auth_gss/svcauth_gss.c
+++ b/net/sunrpc/auth_gss/svcauth_gss.c
@@ -1697,11 +1697,14 @@ static int
svcauth_gss_release(struct svc_rqst *rqstp)
{
struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
- struct rpc_gss_wire_cred *gc = &gsd->clcred;
+ struct rpc_gss_wire_cred *gc;
struct xdr_buf *resbuf = &rqstp->rq_res;
int stat = -EINVAL;
struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
+ if (!gsd)
+ goto out;
+ gc = &gsd->clcred;
if (gc->gc_proc != RPC_GSS_PROC_DATA)
goto out;
/* Release can be called twice, but we only wrap once. */
@@ -1742,10 +1745,10 @@ out_err:
if (rqstp->rq_cred.cr_group_info)
put_group_info(rqstp->rq_cred.cr_group_info);
rqstp->rq_cred.cr_group_info = NULL;
- if (gsd->rsci)
+ if (gsd && gsd->rsci) {
cache_put(&gsd->rsci->h, sn->rsc_cache);
- gsd->rsci = NULL;
-
+ gsd->rsci = NULL;
+ }
return stat;
}
--
2.30.1
next prev parent reply other threads:[~2021-04-05 8:56 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-05 8:53 [PATCH 4.4 00/28] 4.4.265-rc1 review Greg Kroah-Hartman
2021-04-05 8:53 ` [PATCH 4.4 01/28] selinux: vsock: Set SID for socket returned by accept() Greg Kroah-Hartman
2021-04-05 8:53 ` [PATCH 4.4 02/28] ipv6: weaken the v4mapped source check Greg Kroah-Hartman
2021-04-05 8:53 ` [PATCH 4.4 03/28] ext4: fix bh ref count on error paths Greg Kroah-Hartman
2021-04-05 8:53 ` Greg Kroah-Hartman [this message]
2021-04-05 8:53 ` [PATCH 4.4 05/28] ASoC: rt5640: Fix dac- and adc- vol-tlv values being off by a factor of 10 Greg Kroah-Hartman
2021-04-05 8:53 ` [PATCH 4.4 06/28] ASoC: rt5651: " Greg Kroah-Hartman
2021-04-05 8:53 ` [PATCH 4.4 07/28] ASoC: sgtl5000: set DAP_AVC_CTRL register to correct default value on probe Greg Kroah-Hartman
2021-04-05 8:53 ` [PATCH 4.4 08/28] scsi: st: Fix a use after free in st_open() Greg Kroah-Hartman
2021-04-05 8:53 ` [PATCH 4.4 09/28] scsi: qla2xxx: Fix broken #endif placement Greg Kroah-Hartman
2021-04-05 8:53 ` [PATCH 4.4 10/28] staging: comedi: cb_pcidas: fix request_irq() warn Greg Kroah-Hartman
2021-04-05 8:53 ` [PATCH 4.4 11/28] staging: comedi: cb_pcidas64: " Greg Kroah-Hartman
2021-04-05 8:53 ` [PATCH 4.4 12/28] ext4: do not iput inode under running transaction in ext4_rename() Greg Kroah-Hartman
2021-04-05 8:53 ` [PATCH 4.4 13/28] appletalk: Fix skb allocation size in loopback case Greg Kroah-Hartman
2021-04-05 8:53 ` [PATCH 4.4 14/28] net: wan/lmc: unregister device when no matching device is found Greg Kroah-Hartman
2021-04-05 8:53 ` [PATCH 4.4 15/28] ALSA: usb-audio: Apply sample rate quirk to Logitech Connect Greg Kroah-Hartman
2021-04-05 8:53 ` [PATCH 4.4 16/28] ALSA: hda/realtek: call alc_update_headset_mode() in hp_automute_hook Greg Kroah-Hartman
2021-04-05 8:53 ` [PATCH 4.4 17/28] tracing: Fix stack trace event size Greg Kroah-Hartman
2021-04-05 8:53 ` [PATCH 4.4 18/28] mm: fix race by making init_zero_pfn() early_initcall Greg Kroah-Hartman
2021-04-05 8:53 ` [PATCH 4.4 19/28] reiserfs: update reiserfs_xattrs_initialized() condition Greg Kroah-Hartman
2021-04-05 8:53 ` [PATCH 4.4 20/28] pinctrl: rockchip: fix restore error in resume Greg Kroah-Hartman
2021-04-05 8:53 ` [PATCH 4.4 21/28] extcon: Fix error handling in extcon_dev_register Greg Kroah-Hartman
2021-04-05 8:53 ` [PATCH 4.4 22/28] firewire: nosy: Fix a use-after-free bug in nosy_ioctl() Greg Kroah-Hartman
2021-04-05 8:53 ` [PATCH 4.4 23/28] USB: quirks: ignore remote wake-up on Fibocom L850-GL LTE modem Greg Kroah-Hartman
2021-04-05 8:53 ` [PATCH 4.4 24/28] cdc-acm: fix BREAK rx code path adding necessary calls Greg Kroah-Hartman
2021-04-05 8:53 ` [PATCH 4.4 25/28] USB: cdc-acm: downgrade message to debug Greg Kroah-Hartman
2021-04-05 8:54 ` [PATCH 4.4 26/28] USB: cdc-acm: fix use-after-free after probe failure Greg Kroah-Hartman
2021-04-05 8:54 ` [PATCH 4.4 27/28] staging: rtl8192e: Fix incorrect source in memcpy() Greg Kroah-Hartman
2021-04-05 8:54 ` [PATCH 4.4 28/28] staging: rtl8192e: Change state information from u16 to u8 Greg Kroah-Hartman
2021-04-05 17:53 ` [PATCH 4.4 00/28] 4.4.265-rc1 review Guenter Roeck
2021-04-06 0:30 ` Shuah Khan
2021-04-10 9:22 ` Greg Kroah-Hartman
2021-04-06 7:48 ` Naresh Kamboju
2021-04-10 9:22 ` Greg Kroah-Hartman
2021-04-07 8:25 ` Pavel Machek
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