During testing in ARM32 platforms, observed below kernel panic, as driver
accessing data beyond the allocated memory while submitting URB to USB.
Fix: Resolved this by specifying correct length by considering 64 bit
alignment. so that, USB bus driver will access only allocated memory.
Unit-test: Tested and confirm that driver bring up and scanning,
connection and data transfer works fine with this fix.
...skipping...
[ 25.389450] Unable to handle kernel paging request at virtual
address 5aa11422
[ 25.403078] Internal error: Oops: 5 [#1] SMP ARM
[ 25.407703] Modules linked in: rsi_usb
[ 25.411473] CPU: 1 PID: 317 Comm: RX-Thread Not tainted 4.18.0-rc7 #1
[ 25.419221] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
[ 25.425764] PC is at skb_release_data+0x90/0x168
[ 25.430393] LR is at skb_release_all+0x28/0x2c
[ 25.434842] pc : [<807435b0>] lr : [<80742ba0>] psr: 200e0013 5aa1141e
[ 25.464633] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none
[ 25.477524] Process RX-Thread (pid: 317, stack limit = 0x(ptrval))
[ 25.483709] Stack: (0xedf69ed8 to 0xedf6a000)
[ 25.569907] Backtrace:
[ 25.572368] [<80743520>] (skb_release_data) from [<80742ba0>]
(skb_release_all+0x28/0x2c)
[ 25.580555] r9:7f00258c r8:00000001 r7:ee355000 r6:eddab0d0
r5:eddab000 r4:eddbb840
[ 25.588308] [<80742b78>] (skb_release_all) from [<807432cc>]
(consume_skb+0x30/0x50)
[ 25.596055] r5:eddab000 r4:eddbb840
[ 25.599648] [<8074329c>] (consume_skb) from [<7f00117c>]
(rsi_usb_rx_thread+0x64/0x12c [rsi_usb])
[ 25.608524] r5:eddab000 r4:eddbb840
[ 25.612116] [<7f001118>] (rsi_usb_rx_thread [rsi_usb]) from
[<80142750>] (kthread+0x11c/0x15c)
[ 25.620735] r10:ee9ff9e0 r9:edcde3b8 r8:ee355000 r7:edf68000
r6:edd3a780 r5:00000000
[ 25.628567] r4:edcde380
[ 25.631110] [<80142634>] (kthread) from [<801010e8>]
(ret_from_fork+0x14/0x2c)
[ 25.638336] Exception stack(0xedf69fb0 to 0xedf69ff8)
[ 25.682929] ---[ end trace 8236a5496f5b5d3b ]---
Signed-off-by: Siva Rebbagondla <siva.rebbagondla@redpinesignals.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
baa8caf4ab