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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Johannes Thumshirn <jth@kernel.org>,
	David Sterba <dsterba@suse.com>, Sasha Levin <sashal@kernel.org>,
	linux-btrfs@vger.kernel.org
Subject: [PATCH AUTOSEL 5.5 419/542] btrfs: fix possible NULL-pointer dereference in integrity checks
Date: Fri, 14 Feb 2020 10:46:51 -0500
Message-ID: <20200214154854.6746-419-sashal@kernel.org> (raw)
In-Reply-To: <20200214154854.6746-1-sashal@kernel.org>

From: Johannes Thumshirn <jth@kernel.org>

[ Upstream commit 3dbd351df42109902fbcebf27104149226a4fcd9 ]

A user reports a possible NULL-pointer dereference in
btrfsic_process_superblock(). We are assigning state->fs_info to a local
fs_info variable and afterwards checking for the presence of state.

While we would BUG_ON() a NULL state anyways, we can also just remove
the local fs_info copy, as fs_info is only used once as the first
argument for btrfs_num_copies(). There we can just pass in
state->fs_info as well.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=205003
Signed-off-by: Johannes Thumshirn <jth@kernel.org>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/btrfs/check-integrity.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/btrfs/check-integrity.c b/fs/btrfs/check-integrity.c
index 0b52ab4cb9649..72c70f59fc605 100644
--- a/fs/btrfs/check-integrity.c
+++ b/fs/btrfs/check-integrity.c
@@ -629,7 +629,6 @@ static struct btrfsic_dev_state *btrfsic_dev_state_hashtable_lookup(dev_t dev,
 static int btrfsic_process_superblock(struct btrfsic_state *state,
 				      struct btrfs_fs_devices *fs_devices)
 {
-	struct btrfs_fs_info *fs_info = state->fs_info;
 	struct btrfs_super_block *selected_super;
 	struct list_head *dev_head = &fs_devices->devices;
 	struct btrfs_device *device;
@@ -700,7 +699,7 @@ static int btrfsic_process_superblock(struct btrfsic_state *state,
 			break;
 		}
 
-		num_copies = btrfs_num_copies(fs_info, next_bytenr,
+		num_copies = btrfs_num_copies(state->fs_info, next_bytenr,
 					      state->metablock_size);
 		if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES)
 			pr_info("num_copies(log_bytenr=%llu) = %d\n",
-- 
2.20.1


  parent reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200214154854.6746-1-sashal@kernel.org>
2020-02-14 15:41 ` [PATCH AUTOSEL 5.5 123/542] Btrfs: keep pages dirty when using btrfs_writepage_fixup_worker Sasha Levin
2020-02-14 15:46 ` Sasha Levin [this message]
2020-02-14 15:46 ` [PATCH AUTOSEL 5.5 420/542] btrfs: safely advance counter when looking up bio csums Sasha Levin
2020-02-14 15:46 ` [PATCH AUTOSEL 5.5 421/542] btrfs: device stats, log when stats are zeroed Sasha Levin
2020-02-14 15:47 ` [PATCH AUTOSEL 5.5 448/542] btrfs: separate definition of assertion failure handlers Sasha Levin
2020-02-14 15:47 ` [PATCH AUTOSEL 5.5 449/542] btrfs: Fix split-brain handling when changing FSID to metadata uuid Sasha Levin
2020-02-14 15:48 ` [PATCH AUTOSEL 5.5 503/542] btrfs: do not do delalloc reservation under page lock Sasha Levin

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