This is a note to let you know that I've just added the patch titled
btrfs: scrub: Set bbio to NULL before calling btrfs_map_block
to the 4.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
btrfs-scrub-set-bbio-to-null-before-calling-btrfs_map_block.patch
and it can be found in the queue-4.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f1fee6534dcfbf468a159789aa202db2bce8c200 Mon Sep 17 00:00:00 2001
From: Zhao Lei <zhaolei@xxxxxxxxxxxxxx>
Date: Tue, 17 May 2016 17:37:38 +0800
Subject: btrfs: scrub: Set bbio to NULL before calling btrfs_map_block
From: Zhao Lei <zhaolei@xxxxxxxxxxxxxx>
commit f1fee6534dcfbf468a159789aa202db2bce8c200 upstream.
We usually call btrfs_put_bbio() when btrfs_map_block() failed,
btrfs_put_bbio() works right whether bbio is a valid value, or NULL.
But there is a exception, in some case, btrfs_map_block() will return
fail without touching *bbio(keeping its original value), and if bbio
was not initialized yet, invalid memory accessing will happened.
Above case is in scrub_missing_raid56_pages(), and similar case in
scrub_raid56_parity().
Signed-off-by: Zhao Lei <zhaolei@xxxxxxxxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/scrub.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -2179,7 +2179,7 @@ static void scrub_missing_raid56_pages(s
struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
u64 length = sblock->page_count * PAGE_SIZE;
u64 logical = sblock->pagev[0]->logical;
- struct btrfs_bio *bbio;
+ struct btrfs_bio *bbio = NULL;
struct bio *bio;
struct btrfs_raid_bio *rbio;
int ret;
@@ -2980,6 +2980,7 @@ again:
extent_len);
mapped_length = extent_len;
+ bbio = NULL;
ret = btrfs_map_block(fs_info, READ, extent_logical,
&mapped_length, &bbio, 0);
if (!ret) {
Patches currently in stable-queue which might be from zhaolei@xxxxxxxxxxxxxx are
queue-4.5/btrfs-scrub-set-bbio-to-null-before-calling-btrfs_map_block.patch
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