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| author | Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> | 2016-03-10 03:30:14 +0100 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2016-03-30 15:02:37 +0200 |
| commit | 894f2fc44f2f3f48c36c973b1123f6ab298be160 (patch) | |
| tree | 4ca2d58c4ab5f9c8d30703e8c68dbf016396c42f /drivers/media | |
| parent | usb: gadget: f_midi: Fixed a bug when buflen was smaller than wMaxPacketSize (diff) | |
| download | linux-894f2fc44f2f3f48c36c973b1123f6ab298be160.tar.xz linux-894f2fc44f2f3f48c36c973b1123f6ab298be160.zip | |
usb: renesas_usbhs: avoid NULL pointer derefernce in usbhsf_pkt_handler()
When unexpected situation happened (e.g. tx/rx irq happened while
DMAC is used), the usbhsf_pkt_handler() was possible to cause NULL
pointer dereference like the followings:
Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = c0004000
[00000000] *pgd=00000000
Internal error: Oops: 80000007 [#1] SMP ARM
Modules linked in: usb_f_acm u_serial g_serial libcomposite
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.5.0-rc6-00842-gac57066-dirty #63
Hardware name: Generic R8A7790 (Flattened Device Tree)
task: c0729c00 ti: c0724000 task.ti: c0724000
PC is at 0x0
LR is at usbhsf_pkt_handler+0xac/0x118
pc : [<00000000>] lr : [<c03257e0>] psr: 60000193
sp : c0725db8 ip : 00000000 fp : c0725df4
r10: 00000001 r9 : 00000193 r8 : ef3ccab4
r7 : ef3cca10 r6 : eea4586c r5 : 00000000 r4 : ef19ceb4
r3 : 00000000 r2 : 0000009c r1 : c0725dc4 r0 : ef19ceb4
This patch adds a condition to avoid the dereference.
Fixes: e73a989 ("usb: renesas_usbhs: add DMAEngine support")
Cc: <stable@vger.kernel.org> # v3.1+
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/media')
0 files changed, 0 insertions, 0 deletions