Commit 479d6b39 authored by Fred Klassen's avatar Fred Klassen Committed by Corey Minyard

ipmi: Prevent use-after-free in deliver_response

Some IPMI modules (e.g. ibmpex_msg_handler()) will have ipmi_usr_hdlr
handlers that call ipmi_free_recv_msg() directly. This will essentially
kfree(msg), leading to use-after-free.

This does not happen in the ipmi_devintf module, which will queue the
message and run ipmi_free_recv_msg() later.

BUG: KASAN: use-after-free in deliver_response+0x12f/0x1b0
Read of size 8 at addr ffff888a7bf20018 by task ksoftirqd/3/27
CPU: 3 PID: 27 Comm: ksoftirqd/3 Tainted: G           O      4.19.11-amd64-ani99-debug #12.0.1.601133+pv
Hardware name: AppNeta r1000/X11SPW-TF, BIOS 2.1a-AP 09/17/2018
Call Trace:
dump_stack+0x92/0xeb
print_address_description+0x73/0x290
kasan_report+0x258/0x380
deliver_response+0x12f/0x1b0
? ipmi_free_recv_msg+0x50/0x50
deliver_local_response+0xe/0x50
handle_one_recv_msg+0x37a/0x21d0
handle_new_recv_msgs+0x1ce/0x440
...

Allocated by task 9885:
kasan_kmalloc+0xa0/0xd0
kmem_cache_alloc_trace+0x116/0x290
ipmi_alloc_recv_msg+0x28/0x70
i_ipmi_request+0xb4a/0x1640
ipmi_request_settime+0x1b8/0x1e0
...

Freed by task 27:
__kasan_slab_free+0x12e/0x180
kfree+0xe9/0x280
deliver_response+0x122/0x1b0
deliver_local_response+0xe/0x50
handle_one_recv_msg+0x37a/0x21d0
handle_new_recv_msgs+0x1ce/0x440
tasklet_action_common.isra.19+0xc4/0x250
__do_softirq+0x11f/0x51f

Fixes: e86ee2d4 ("ipmi: Rework locking and shutdown for hot remove")
Cc: stable@vger.kernel.org # 4.18
Signed-off-by: default avatarFred Klassen <fklassen@appneta.com>
Signed-off-by: default avatarCorey Minyard <cminyard@mvista.com>
parent a7102c74
...@@ -885,7 +885,7 @@ static int deliver_response(struct ipmi_smi *intf, struct ipmi_recv_msg *msg) ...@@ -885,7 +885,7 @@ static int deliver_response(struct ipmi_smi *intf, struct ipmi_recv_msg *msg)
if (user) { if (user) {
user->handler->ipmi_recv_hndl(msg, user->handler_data); user->handler->ipmi_recv_hndl(msg, user->handler_data);
release_ipmi_user(msg->user, index); release_ipmi_user(user, index);
} else { } else {
/* User went away, give up. */ /* User went away, give up. */
ipmi_free_recv_msg(msg); ipmi_free_recv_msg(msg);
......
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