4.9-stable patches

added patches:
	ext4-avoid-crash-when-inline-data-creation-follows-dio-write.patch

diff --git a/queue-4.9/ext4-avoid-crash-when-inline-data-creation-follows-dio-write.patch b/queue-4.9/ext4-avoid-crash-when-inline-data-creation-follows-dio-write.patch
new file mode 100644 (file)
index 0000000..b6b233b
--- /dev/null
+++ b/queue-4.9/ext4-avoid-crash-when-inline-data-creation-follows-dio-write.patch
@@ -0,0 +1,78 @@
+From 4bb26f2885ac6930984ee451b952c5a6042f2c0e Mon Sep 17 00:00:00 2001
+From: Jan Kara <jack@suse.cz>
+Date: Wed, 27 Jul 2022 17:57:53 +0200
+Subject: ext4: avoid crash when inline data creation follows DIO write
+
+From: Jan Kara <jack@suse.cz>
+
+commit 4bb26f2885ac6930984ee451b952c5a6042f2c0e upstream.
+
+When inode is created and written to using direct IO, there is nothing
+to clear the EXT4_STATE_MAY_INLINE_DATA flag. Thus when inode gets
+truncated later to say 1 byte and written using normal write, we will
+try to store the data as inline data. This confuses the code later
+because the inode now has both normal block and inline data allocated
+and the confusion manifests for example as:
+
+kernel BUG at fs/ext4/inode.c:2721!
+invalid opcode: 0000 [#1] PREEMPT SMP KASAN
+CPU: 0 PID: 359 Comm: repro Not tainted 5.19.0-rc8-00001-g31ba1e3b8305-dirty #15
+Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-1.fc36 04/01/2014
+RIP: 0010:ext4_writepages+0x363d/0x3660
+RSP: 0018:ffffc90000ccf260 EFLAGS: 00010293
+RAX: ffffffff81e1abcd RBX: 0000008000000000 RCX: ffff88810842a180
+RDX: 0000000000000000 RSI: 0000008000000000 RDI: 0000000000000000
+RBP: ffffc90000ccf650 R08: ffffffff81e17d58 R09: ffffed10222c680b
+R10: dfffe910222c680c R11: 1ffff110222c680a R12: ffff888111634128
+R13: ffffc90000ccf880 R14: 0000008410000000 R15: 0000000000000001
+FS:  00007f72635d2640(0000) GS:ffff88811b000000(0000) knlGS:0000000000000000
+CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
+CR2: 0000565243379180 CR3: 000000010aa74000 CR4: 0000000000150eb0
+Call Trace:
+ <TASK>
+ do_writepages+0x397/0x640
+ filemap_fdatawrite_wbc+0x151/0x1b0
+ file_write_and_wait_range+0x1c9/0x2b0
+ ext4_sync_file+0x19e/0xa00
+ vfs_fsync_range+0x17b/0x190
+ ext4_buffered_write_iter+0x488/0x530
+ ext4_file_write_iter+0x449/0x1b90
+ vfs_write+0xbcd/0xf40
+ ksys_write+0x198/0x2c0
+ __x64_sys_write+0x7b/0x90
+ do_syscall_64+0x3d/0x90
+ entry_SYSCALL_64_after_hwframe+0x63/0xcd
+ </TASK>
+
+Fix the problem by clearing EXT4_STATE_MAY_INLINE_DATA when we are doing
+direct IO write to a file.
+
+Cc: stable@kernel.org
+Reported-by: Tadeusz Struk <tadeusz.struk@linaro.org>
+Reported-by: syzbot+bd13648a53ed6933ca49@syzkaller.appspotmail.com
+Link: https://syzkaller.appspot.com/bug?id=a1e89d09bbbcbd5c4cb45db230ee28c822953984
+Signed-off-by: Jan Kara <jack@suse.cz>
+Reviewed-by: Lukas Czerner <lczerner@redhat.com>
+Tested-by: Tadeusz Struk<tadeusz.struk@linaro.org>
+Link: https://lore.kernel.org/r/20220727155753.13969-1-jack@suse.cz
+Signed-off-by: Theodore Ts'o <tytso@mit.edu>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/ext4/file.c |    6 ++++++
+ 1 file changed, 6 insertions(+)
+
+--- a/fs/ext4/file.c
++++ b/fs/ext4/file.c
+@@ -538,6 +538,12 @@ static loff_t ext4_seek_data(struct file
+               inode_unlock(inode);
+               return -ENXIO;
+       }
++      /*
++       * Make sure inline data cannot be created anymore since we are going
++       * to allocate blocks for DIO. We know the inode does not have any
++       * inline data now because ext4_dio_supported() checked for that.
++       */
++      ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
+ 
+       blkbits = inode->i_sb->s_blocksize_bits;
+       start = offset >> blkbits;

diff --git a/queue-4.9/series b/queue-4.9/series
index 9afece0fc8db626277efacb98450e7bee18522b1..1110bef0a2fde6ba0ed0b9d90b5ce6a5a7e9e923 100644 (file)
--- a/queue-4.9/series
+++ b/queue-4.9/series
@@ -52,3 +52,4 @@ um-cpuinfo-fix-a-warning-for-config_cpumask_offstack.patch
 pci-sanitise-firmware-bar-assignments-behind-a-pci-pci-bridge.patch
 fbdev-smscufx-fix-use-after-free-in-ufx_ops_open.patch
 nilfs2-fix-use-after-free-bug-of-struct-nilfs_root.patch
+ext4-avoid-crash-when-inline-data-creation-follows-dio-write.patch