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Message-ID: <000000000000443e28061c2ba0ea@google.com>
Date: Mon, 01 Jul 2024 01:45:58 -0700
From: syzbot <syzbot+18df508cf00a0598d9a6@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [PATCH] handle EFSCORRUPTED, drop EXT4_STATE_MAY_INLINE_DATA
sanity check
For archival purposes, forwarding an incoming command email to
linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com.
***
Subject: [PATCH] handle EFSCORRUPTED, drop EXT4_STATE_MAY_INLINE_DATA sanity check
Author: wojciech.gladysz@...ogain.com
#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
---
fs/buffer.c | 5 ++++-
fs/ext4/inode.c | 5 +++++
2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index 4f73d23c2c46..10514fa9851c 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2163,7 +2163,10 @@ static void __block_commit_write(struct folio *folio, size_t from, size_t to)
unsigned blocksize;
struct buffer_head *bh, *head;
- bh = head = folio_buffers(folio);
+ head = folio_buffers(folio);
+ if (!head)
+ return;
+ bh = head;
blocksize = bh->b_size;
block_start = 0;
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 537803250ca9..e7a6958025ee 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2948,6 +2948,11 @@ static int ext4_da_do_write_end(struct address_space *mapping,
bool disksize_changed = false;
loff_t new_i_size;
+ if (unlikely(!folio_buffers(folio))) {
+ folio_unlock(folio);
+ folio_put(folio);
+ return -EIO;
+ }
/*
* block_write_end() will mark the inode as dirty with I_DIRTY_PAGES
* flag, which all that's needed to trigger page writeback.
--
2.35.3
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