The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 421f0922a2cfb0c75acd9746454aaa576c711a65 Mon Sep 17 00:00:00 2001
From: Filipe Manana <fdmanana@xxxxxxxx>
Date: Fri, 12 Oct 2018 13:02:48 +0100
Subject: [PATCH] Btrfs: fix use-after-free during inode eviction
At inode.c:evict_inode_truncate_pages(), when we iterate over the
inode's extent states, we access an extent state record's "state" field
after we unlocked the inode's io tree lock. This can lead to a
use-after-free issue because after we unlock the io tree that extent
state record might have been freed due to being merged into another
adjacent extent state record (a previous inflight bio for a read
operation finished in the meanwhile which unlocked a range in the io
tree and cause a merge of extent state records, as explained in the
comment before the while loop added in commit 6ca0709756710 ("Btrfs: fix
hang during inode eviction due to concurrent readahead")).
Fix this by keeping a copy of the extent state's flags in a local
variable and using it after unlocking the io tree.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=201189
Fixes: b9d0b38928e2 ("btrfs: Add handler for invalidate page")
CC: stable@xxxxxxxxxxxxxxx # 4.4+
Reviewed-by: Qu Wenruo <wqu@xxxxxxxx>
Signed-off-by: Filipe Manana <fdmanana@xxxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 28625f344952..f4d31fd62eed 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5268,11 +5268,13 @@ static void evict_inode_truncate_pages(struct inode *inode)
struct extent_state *cached_state = NULL;
u64 start;
u64 end;
+ unsigned state_flags;
node = rb_first(&io_tree->state);
state = rb_entry(node, struct extent_state, rb_node);
start = state->start;
end = state->end;
+ state_flags = state->state;
spin_unlock(&io_tree->lock);
lock_extent_bits(io_tree, start, end, &cached_state);
@@ -5285,7 +5287,7 @@ static void evict_inode_truncate_pages(struct inode *inode)
*
* Note, end is the bytenr of last byte, so we need + 1 here.
*/
- if (state->state & EXTENT_DELALLOC)
+ if (state_flags & EXTENT_DELALLOC)
btrfs_qgroup_free_data(inode, NULL, start, end - start + 1);
clear_extent_bit(io_tree, start, end,
