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h=From:To:Cc:Subject:Date:In-Reply-To:References; b=p5Ru6ZUzBdYcgAA/DvsG1qV+UwFHpVhC425WNXaVRjEB7bjlSWzJuSFfOqKovE6AU sxWNT+b/YY3bDE0VsX/qthI0XeFtJT6+/qevhbgXswmwchMG0b1OxKalQplqKGoXUM DcQI+u/SwjokXggvgUP57hbbab6wrAt0G+62F+Nk= Received: from pek-lxu-l1.wrs.com ([111.198.225.215]) by newxmesmtplogicsvrszb9-0.qq.com (NewEsmtp) with SMTP id 93334A1C; Tue, 02 Jan 2024 20:36:51 +0800 X-QQ-mid: xmsmtpt1704199011tmjb9ifyq Message-ID: X-QQ-XMAILINFO: N7h1OCCDntujvVtpMWdxaTVHmbrXzaCl4eDQp1ppMvKr1B3sZmiP2rPKkpDVT2 Wx22gtapO0SWIPeDdMHzM/pDsl7mOzDQP48b0kIWc35lT2+9r8zpfTFP+HKYPUWHHLByu0/s4Ae0 x2ApYkcNEvsVXDZKfqJgLcAJayxcTN+XUyts0x5OPOhqCceFUC12mZy6McngXf/2DnTK2mJyqfHZ l4H37h5XXIRzXAclsR/47rr3lL7/VuUJ6P8siruJeUdyXbUcAiNoLnHGViUaJ6/3dTelzTVjJ7hB NYTEMxUu3l3pBaqkXHKRstFYz4tgRIIdBOWlePjNYSSTqHKnWlI39YU1FY1yFPopiTLtrK2vmg+t vfcpNz5u0lmRkF7vfwfPjxx5+t25QGqtcgwXuPRFxLLD5xpXmyoV8zwqMhpsoeGblOFxun5x8Ce+ btmdSKb2dNRV9GLxSZp/csIEVUlDim/DeIg8fJeVS1CV4EVn7Us8wR/7z7Yyjry2sk2tbSOKk/d0 fxG9ock9UqKE62M9ivXdHKIuIecQlcLBzO4xkgn3bUHCTAsmhS0VZ40mfCFKSCw5aNQ68M6PTCWt ZnRmLqFfNPSN4HHf/OF208uflBXEP6+3EYF8nGxWTfvL6OjPtcqlXPIZCtbcnMDs4JOdgrpmlXTW HPvnyHjAkVnBD6G/FofN95KWRnoadgUqQxN1yU5NjG8Iy5emIANXUeUhPrM7AvvzrwDhXky7Awnk DB7S8uapn1593i1VneE+x5cFU7zZa3A8nknRZ/OU02fTEoZ4gP2Fnpacypdcda/WpR0yk3YpdM6Z LHR6yjY+sqSrSkJt8p7VRL7YTgbVGLJ487OwXJ6++h9QKYOBgF4ca++/iIvq7Hu7fyKgVbdFzY2n 0Uz9Uk3y5OkUo1Uy4d+p+9cZ6V8ZsGwSr/H/58X2mmXGGANpazBfPYieixh0XEAbrHW4iiYF/zhK zH6adJif8= X-QQ-XMRINFO: NyFYKkN4Ny6FSmKK/uo/jdU= From: Edward Adam Davis To: syzbot+41a88b825a315aac2254@syzkaller.appspotmail.com Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, willy@infradead.org Subject: [PATCH] hfs: fix deadlock in hfs_extend_file Date: Tue, 2 Jan 2024 20:36:51 +0800 X-OQ-MSGID: <20240102123651.1582577-2-eadavis@qq.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <0000000000004efa57060def87be@google.com> References: <0000000000004efa57060def87be@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1786982538577754599 X-GMAIL-MSGID: 1786982538577754599 [syz report] syz-executor279/5059 is trying to acquire lock: ffff888079c100f8 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}, at: hfs_extend_file+0xa2/0xb10 fs/hfs/extent.c:397 but task is already holding lock: ffff888079c10778 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}, at: hfs_extend_file+0xa2/0xb10 fs/hfs/extent.c:397 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&HFS_I(tree->inode)->extents_lock); lock(&HFS_I(tree->inode)->extents_lock); *** DEADLOCK *** [Analysis] hfs_extend_file()-> hfs_ext_read_extent()-> __hfs_ext_cache_extent()-> __hfs_ext_write_extent()-> hfs_bmap_reserve()-> hfs_extend_file()-> When an inode has both the HFS_FLG_EXT_DIRTY and HFS_FLG_EXT_NEW flags, it will enter the above loop and trigger a deadlock. [Fix] In hfs_ext_read_extent(), check if the above two flags exist simultaneously, and exit the subsequent process when the conditions are met. Reported-and-tested-by: syzbot+41a88b825a315aac2254@syzkaller.appspotmail.com Signed-off-by: Edward Adam Davis --- fs/hfs/extent.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/hfs/extent.c b/fs/hfs/extent.c index 6d1878b99b30..1b02c7b6a10c 100644 --- a/fs/hfs/extent.c +++ b/fs/hfs/extent.c @@ -197,6 +197,10 @@ static int hfs_ext_read_extent(struct inode *inode, u16 block) block < HFS_I(inode)->cached_start + HFS_I(inode)->cached_blocks) return 0; + if (HFS_I(inode)->flags & HFS_FLG_EXT_DIRTY && + HFS_I(inode)->flags & HFS_FLG_EXT_NEW) + return -ENOENT; + res = hfs_find_init(HFS_SB(inode->i_sb)->ext_tree, &fd); if (!res) { res = __hfs_ext_cache_extent(&fd, inode, block);