lkml.org 
[lkml]   [2021]   [Jul]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] mtd: hyperbus: rpc-if: fix bug in rpcif_hb_remove
Date
From: "George G. Davis" <davis.george@siemens.com>

The following KASAN BUG is observed when testing the rpc-if driver on
rcar-gen3:

root@rcar-gen3:~# modprobe -r rpc-if
[ 101.930146] ==================================================================
[ 101.937408] BUG: KASAN: slab-out-of-bounds in __lock_acquire+0x518/0x25d0
[ 101.944240] Read of size 8 at addr ffff0004c5be2750 by task modprobe/664
[ 101.950959]
[ 101.952466] CPU: 2 PID: 664 Comm: modprobe Not tainted 5.14.0-rc1-00342-g1a1464d7aa31 #1
[ 101.960578] Hardware name: Renesas H3ULCB board based on r8a77951 (DT)
[ 101.967120] Call trace:
[ 101.969580] dump_backtrace+0x0/0x2c0
[ 101.973275] show_stack+0x1c/0x30
[ 101.976616] dump_stack_lvl+0x9c/0xd8
[ 101.980301] print_address_description.constprop.0+0x74/0x2b8
[ 101.986071] kasan_report+0x1f4/0x26c
[ 101.989757] __asan_load8+0x98/0xd4
[ 101.993266] __lock_acquire+0x518/0x25d0
[ 101.997215] lock_acquire.part.0+0x18c/0x360
[ 102.001506] lock_acquire+0x74/0x90
[ 102.005013] _raw_spin_lock_irq+0x98/0x130
[ 102.009131] __pm_runtime_disable+0x30/0x210
[ 102.013427] rpcif_hb_remove+0x5c/0x70 [rpc_if]
[ 102.018001] platform_remove+0x40/0x80
[ 102.021771] __device_release_driver+0x234/0x350
[ 102.026412] driver_detach+0x158/0x20c
[ 102.030179] bus_remove_driver+0xa0/0x140
[ 102.034212] driver_unregister+0x48/0x80
[ 102.038153] platform_driver_unregister+0x18/0x24
[ 102.042879] rpcif_platform_driver_exit+0x1c/0x34 [rpc_if]
[ 102.048400] __arm64_sys_delete_module+0x210/0x310
[ 102.053212] invoke_syscall+0x60/0x190
[ 102.056986] el0_svc_common+0x12c/0x144
[ 102.060844] do_el0_svc+0x88/0xac
[ 102.064181] el0_svc+0x24/0x3c
[ 102.067257] el0t_64_sync_handler+0x1a8/0x1b0
[ 102.071634] el0t_64_sync+0x198/0x19c
[ 102.075315]
[ 102.076815] Allocated by task 628:
[ 102.080781]
[ 102.082280] Last potentially related work creation:
[ 102.087524]
[ 102.089022] The buggy address belongs to the object at ffff0004c5be2000
[ 102.089022] which belongs to the cache kmalloc-2k of size 2048
[ 102.101555] The buggy address is located 1872 bytes inside of
[ 102.101555] 2048-byte region [ffff0004c5be2000, ffff0004c5be2800)
[ 102.113486] The buggy address belongs to the page:
[ 102.118409]
[ 102.119908] Memory state around the buggy address:
[ 102.124711] ffff0004c5be2600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 102.131947] ffff0004c5be2680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 102.139181] >ffff0004c5be2700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 102.146412] ^
[ 102.152257] ffff0004c5be2780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 102.159491] ffff0004c5be2800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 102.166723] ==================================================================

The above bug is caused by use of the wrong pointer in the
rpcif_disable_rpm() call. Fix the bug by using the correct pointer.

Fixes: e806241e03b7 ("mtd: hyperbus: add Renesas RPC-IF driver")
Signed-off-by: George G. Davis <davis.george@siemens.com>
---
drivers/mtd/hyperbus/rpc-if.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/hyperbus/rpc-if.c b/drivers/mtd/hyperbus/rpc-if.c
index ecb050ba95cd..2806024b50ac 100644
--- a/drivers/mtd/hyperbus/rpc-if.c
+++ b/drivers/mtd/hyperbus/rpc-if.c
@@ -150,9 +150,9 @@ static int rpcif_hb_remove(struct platform_device *pdev)
{
struct rpcif_hyperbus *hyperbus = platform_get_drvdata(pdev);
int error = hyperbus_unregister_device(&hyperbus->hbdev);
- struct rpcif *rpc = dev_get_drvdata(pdev->dev.parent);

- rpcif_disable_rpm(rpc);
+ rpcif_disable_rpm(&hyperbus->rpc);
+
return error;
}

--
2.17.1
\
 
 \ /
  Last update: 2021-07-16 22:58    [W:0.042 / U:2.356 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site