On Thu, Sep 28, 2023 at 11:06:03PM +0200, Michał Mirosław wrote:
> Tegra USB controllers seem to issue DMA in full 32-bit words only and thus
> may overwrite unevenly-sized buffers. One such occurrence is detected by
> SLUB when receiving a reply to a 1-byte buffer (below). Fix this by
> allocating a bounce buffer also for buffers with sizes not a multiple of 4.
>
> =============================================================================
> BUG kmalloc-64 (Tainted: G B ): kmalloc Redzone overwritten
> -----------------------------------------------------------------------------
>
> 0x8555cd02-0x8555cd03 @offset=3330. First byte 0x0 instead of 0xcc
> Allocated in usb_get_status+0x2b/0xac age=1 cpu=3 pid=41
> __kmem_cache_alloc_node+0x12f/0x1e4
> __kmalloc+0x33/0x8c
> usb_get_status+0x2b/0xac
> hub_probe+0x5e9/0xcec
> usb_probe_interface+0xbf/0x21c
> really_probe+0xa5/0x2c4
> __driver_probe_device+0x75/0x174
> driver_probe_device+0x31/0x94
> __device_attach_driver+0x65/0xc0
> bus_for_each_drv+0x4b/0x74
> __device_attach+0x69/0x120
> bus_probe_device+0x65/0x6c
> device_add+0x48b/0x5f8
> usb_set_configuration+0x37b/0x6b4
> usb_generic_driver_probe+0x37/0x68
> usb_probe_device+0x35/0xb4
> Slab 0xbf622b80 objects=21 used=18 fp=0x8555cdc0 flags=0x800(slab|zone=0)
> Object 0x8555cd00 @offset=3328 fp=0x00000000
>
> Redzone 8555ccc0: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc ................
> Redzone 8555ccd0: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc ................
> Redzone 8555cce0: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc ................
> Redzone 8555ccf0: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc ................
> Object 8555cd00: 01 00 00 00 cc cc cc cc cc cc cc cc cc cc cc cc ................
> Object 8555cd10: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc ................
> Object 8555cd20: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc ................
> Object 8555cd30: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc ................
> Redzone 8555cd40: cc cc cc cc ....
> Padding 8555cd74: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZ
> CPU: 3 PID: 41 Comm: kworker/3:1 Tainted: G B 6.6.0-rc1mq-00118-g59786f827ea1 #1115
> Hardware name: NVIDIA Tegra SoC (Flattened Device Tree)
> Workqueue: usb_hub_wq hub_event
> [<8010ca28>] (unwind_backtrace) from [<801090a5>] (show_stack+0x11/0x14)
> [<801090a5>] (show_stack) from [<805da2fb>] (dump_stack_lvl+0x4d/0x7c)
> [<805da2fb>] (dump_stack_lvl) from [<8026464f>] (check_bytes_and_report+0xb3/0xe4)
> [<8026464f>] (check_bytes_and_report) from [<802648e1>] (check_object+0x261/0x290)
> [<802648e1>] (check_object) from [<802671b1>] (free_to_partial_list+0x105/0x3f8)
> [<802671b1>] (free_to_partial_list) from [<80268613>] (__kmem_cache_free+0x103/0x128)
> [<80268613>] (__kmem_cache_free) from [<80425a67>] (usb_get_status+0x73/0xac)
> [<80425a67>] (usb_get_status) from [<80421b31>] (hub_probe+0x5e9/0xcec)
> [<80421b31>] (hub_probe) from [<80428bbb>] (usb_probe_interface+0xbf/0x21c)
> [<80428bbb>] (usb_probe_interface) from [<803ee13d>] (really_probe+0xa5/0x2c4)
> [<803ee13d>] (really_probe) from [<803ee3d1>] (__driver_probe_device+0x75/0x174)
> [<803ee3d1>] (__driver_probe_device) from [<803ee501>] (driver_probe_device+0x31/0x94)
> usb 1-1: device descriptor read/8, error -71
>
> Fixes: fc53d5279094 ("usb: chipidea: tegra: Support host mode")
> Signed-off-by: Michał Mirosław <mirq-linux@xxxxxxxxxxxx>
> ---
> drivers/usb/chipidea/host.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
Acked-by: Thierry Reding <treding@xxxxxxxxxx>
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