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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Pavel Skripkin <paskripkin@gmail.com>,
	syzbot+0ba9909df31c6a36974d@syzkaller.appspotmail.com,
	Jan Kara <jack@suse.cz>, Sasha Levin <sashal@kernel.org>,
	reiserfs-devel@vger.kernel.org
Subject: [PATCH AUTOSEL 4.4 07/31] reiserfs: add check for invalid 1st journal block
Date: Tue,  6 Jul 2021 07:29:07 -0400	[thread overview]
Message-ID: <20210706112931.2066397-7-sashal@kernel.org> (raw)
In-Reply-To: <20210706112931.2066397-1-sashal@kernel.org>

From: Pavel Skripkin <paskripkin@gmail.com>

[ Upstream commit a149127be52fa7eaf5b3681a0317a2bbb772d5a9 ]

syzbot reported divide error in reiserfs.
The problem was in incorrect journal 1st block.

Syzbot's reproducer manualy generated wrong superblock
with incorrect 1st block. In journal_init() wasn't
any checks about this particular case.

For example, if 1st journal block is before superblock
1st block, it can cause zeroing important superblock members
in do_journal_end().

Link: https://lore.kernel.org/r/20210517121545.29645-1-paskripkin@gmail.com
Reported-by: syzbot+0ba9909df31c6a36974d@syzkaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/reiserfs/journal.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c
index 00985f9db9f7..6a0fa0cdc1ed 100644
--- a/fs/reiserfs/journal.c
+++ b/fs/reiserfs/journal.c
@@ -2770,6 +2770,20 @@ int journal_init(struct super_block *sb, const char *j_dev_name,
 		goto free_and_return;
 	}
 
+	/*
+	 * Sanity check to see if journal first block is correct.
+	 * If journal first block is invalid it can cause
+	 * zeroing important superblock members.
+	 */
+	if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
+	    SB_ONDISK_JOURNAL_1st_BLOCK(sb) < SB_JOURNAL_1st_RESERVED_BLOCK(sb)) {
+		reiserfs_warning(sb, "journal-1393",
+				 "journal 1st super block is invalid: 1st reserved block %d, but actual 1st block is %d",
+				 SB_JOURNAL_1st_RESERVED_BLOCK(sb),
+				 SB_ONDISK_JOURNAL_1st_BLOCK(sb));
+		goto free_and_return;
+	}
+
 	if (journal_init_dev(sb, journal, j_dev_name) != 0) {
 		reiserfs_warning(sb, "sh-462",
 				 "unable to initialize journal device");
-- 
2.30.2


  parent reply	other threads:[~2021-07-06 12:04 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-06 11:29 [PATCH AUTOSEL 4.4 01/31] net: pch_gbe: Use proper accessors to BE data in pch_ptp_match() Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 02/31] hugetlb: clear huge pte during flush function on mips platform Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 03/31] atm: iphase: fix possible use-after-free in ia_module_exit() Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 04/31] mISDN: fix possible use-after-free in HFC_cleanup() Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 05/31] atm: nicstar: Fix possible use-after-free in nicstar_cleanup() Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 06/31] net: Treat __napi_schedule_irqoff() as __napi_schedule() on PREEMPT_RT Sasha Levin
2021-07-06 11:29 ` Sasha Levin [this message]
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 08/31] drm/virtio: Fixes a potential NULL pointer dereference on probe failure Sasha Levin
2021-07-12 21:59   ` Pavel Machek
2021-07-14 16:49     ` Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 09/31] drm/virtio: Fix double free " Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 10/31] udf: Fix NULL pointer dereference in udf_symlink function Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 11/31] e100: handle eeprom as little endian Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 12/31] ipv6: use prandom_u32() for ID generation Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 13/31] RDMA/cxgb4: Fix missing error code in create_qp() Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 14/31] dm space maps: don't reset space map allocation cursor when committing Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 15/31] net: micrel: check return value after calling platform_get_resource() Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 16/31] net: moxa: Use devm_platform_get_and_ioremap_resource() Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 17/31] selinux: use __GFP_NOWARN with GFP_NOWAIT in the AVC Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 18/31] xfrm: Fix error reporting in xfrm_state_construct Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 19/31] wlcore/wl12xx: Fix wl12xx get_mac error if device is in ELP Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 20/31] wl1251: Fix possible buffer overflow in wl1251_cmd_scan Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 21/31] cw1200: add missing MODULE_DEVICE_TABLE Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 22/31] atm: nicstar: use 'dma_free_coherent' instead of 'kfree' Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 23/31] atm: nicstar: register the interrupt handler in the right place Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 24/31] sfc: avoid double pci_remove of VFs Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 25/31] sfc: error code if SRIOV cannot be disabled Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 26/31] wireless: wext-spy: Fix out-of-bounds warning Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 27/31] RDMA/cma: Fix rdma_resolve_route() memory leak Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 28/31] Bluetooth: Fix the HCI to MGMT status conversion table Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 29/31] Bluetooth: Shutdown controller after workqueues are flushed or cancelled Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 30/31] Bluetooth: btusb: fix bt fiwmare downloading failure issue for qca btsoc Sasha Levin
2021-07-06 11:29 ` [PATCH AUTOSEL 4.4 31/31] sctp: add size validation when walking chunks Sasha Levin

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