This is a note to let you know that I've just added the patch titled
ksmbd: replace one-element array with flex-array member in struct smb2_ea_info
to the 5.15-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:
ksmbd-replace-one-element-array-with-flex-array-member-in-struct-smb2_ea_info.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0ba5439d9afa2722e7728df56f272c89987540a4 Mon Sep 17 00:00:00 2001
From: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Date: Fri, 25 Aug 2023 23:41:58 +0900
Subject: ksmbd: replace one-element array with flex-array member in struct smb2_ea_info
From: Namjae Jeon <linkinjeon@xxxxxxxxxx>
commit 0ba5439d9afa2722e7728df56f272c89987540a4 upstream.
UBSAN complains about out-of-bounds array indexes on 1-element arrays in
struct smb2_ea_info.
UBSAN: array-index-out-of-bounds in fs/smb/server/smb2pdu.c:4335:15
index 1 is out of range for type 'char [1]'
CPU: 1 PID: 354 Comm: kworker/1:4 Not tainted 6.5.0-rc4 #1
Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop
Reference Platform, BIOS 6.00 07/22/2020
Workqueue: ksmbd-io handle_ksmbd_work [ksmbd]
Call Trace:
<TASK>
__dump_stack linux/lib/dump_stack.c:88
dump_stack_lvl+0x48/0x70 linux/lib/dump_stack.c:106
dump_stack+0x10/0x20 linux/lib/dump_stack.c:113
ubsan_epilogue linux/lib/ubsan.c:217
__ubsan_handle_out_of_bounds+0xc6/0x110 linux/lib/ubsan.c:348
smb2_get_ea linux/fs/smb/server/smb2pdu.c:4335
smb2_get_info_file linux/fs/smb/server/smb2pdu.c:4900
smb2_query_info+0x63ae/0x6b20 linux/fs/smb/server/smb2pdu.c:5275
__process_request linux/fs/smb/server/server.c:145
__handle_ksmbd_work linux/fs/smb/server/server.c:213
handle_ksmbd_work+0x348/0x10b0 linux/fs/smb/server/server.c:266
process_one_work+0x85a/0x1500 linux/kernel/workqueue.c:2597
worker_thread+0xf3/0x13a0 linux/kernel/workqueue.c:2748
kthread+0x2b7/0x390 linux/kernel/kthread.c:389
ret_from_fork+0x44/0x90 linux/arch/x86/kernel/process.c:145
ret_from_fork_asm+0x1b/0x30 linux/arch/x86/entry/entry_64.S:304
</TASK>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ksmbd/smb2pdu.c | 2 +-
fs/ksmbd/smb2pdu.h | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -4289,7 +4289,7 @@ static int smb2_get_ea(struct ksmbd_work
if (!strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
name_len -= XATTR_USER_PREFIX_LEN;
- ptr = (char *)(&eainfo->name + name_len + 1);
+ ptr = eainfo->name + name_len + 1;
buf_free_len -= (offsetof(struct smb2_ea_info, name) +
name_len + 1);
/* bailout if xattr can't fit in buf_free_len */
--- a/fs/ksmbd/smb2pdu.h
+++ b/fs/ksmbd/smb2pdu.h
@@ -1567,7 +1567,7 @@ struct smb2_ea_info {
__u8 Flags;
__u8 EaNameLength;
__le16 EaValueLength;
- char name[1];
+ char name[];
/* optionally followed by value */
} __packed; /* level 15 Query */
Patches currently in stable-queue which might be from linkinjeon@xxxxxxxxxx are
queue-5.15/ksmbd-fix-wrong-dataoffset-validation-of-create-context.patch
queue-5.15/ksmbd-replace-one-element-array-with-flex-array-member-in-struct-smb2_ea_info.patch
