CVE-2022-50614

In the Linux kernel, the following vulnerability has been resolved:

misc: pciendpointtest: Fix pciendpointtest_{copy,write,read}() panic

The dmamapsingle() doesn't permit zero length mapping. It causes a follow panic.

A panic was reported on arm64:

[ 60.137988] ------------[ cut here ]------------ [ 60.142630] kernel BUG at kernel/dma/swiotlb.c:624! [ 60.147508] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP [ 60.152992] Modules linked in: dwhdmicec crct10difce simplebridge rcarfdp1 vsp1 rcarvin videobuf2vmalloc rcarcsi2 v4l 2mem2mem videobuf2dmacontig videobuf2memops pciendpointtest videobuf2v4l2 videobuf2common rcarfcp v4l2fwnode v4l2asyn c videodev mc gpiobd9571mwv max9611 pwmrcar ccree at24 authenc libdes phyrcargen3usb3 usbdmac displayconnector pwmbl [ 60.186252] CPU: 0 PID: 508 Comm: pcitest Not tainted 6.0.0-rc1rpci-dev+ #237 [ 60.193387] Hardware name: Renesas Salvator-X 2nd version board based on r8a77951 (DT) [ 60.201302] pstate: 00000005 (nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 60.208263] pc : swiotlbtblmapsingle+0x2c0/0x590 [ 60.213149] lr : swiotlbmap+0x88/0x1f0 [ 60.216982] sp : ffff80000a883bc0 [ 60.220292] x29: ffff80000a883bc0 x28: 0000000000000000 x27: 0000000000000000 [ 60.227430] x26: 0000000000000000 x25: ffff0004c0da20d0 x24: ffff80000a1f77c0 [ 60.234567] x23: 0000000000000002 x22: 0001000040000010 x21: 000000007a000000 [ 60.241703] x20: 0000000000200000 x19: 0000000000000000 x18: 0000000000000000 [ 60.248840] x17: 0000000000000000 x16: 0000000000000000 x15: ffff0006ff7b9180 [ 60.255977] x14: ffff0006ff7b9180 x13: 0000000000000000 x12: 0000000000000000 [ 60.263113] x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000 [ 60.270249] x8 : 0001000000000010 x7 : ffff0004c6754b20 x6 : 0000000000000000 [ 60.277385] x5 : ffff0004c0da2090 x4 : 0000000000000000 x3 : 0000000000000001 [ 60.284521] x2 : 0000000040000000 x1 : 0000000000000000 x0 : 0000000040000010 [ 60.291658] Call trace: [ 60.294100] swiotlbtblmapsingle+0x2c0/0x590 [ 60.298629] swiotlbmap+0x88/0x1f0 [ 60.302115] dmamappageattrs+0x188/0x230 [ 60.306299] pciendpointtestioctl+0x5e4/0xd90 [pciendpoint_test] [ 60.312660] _arm64sysioctl+0xa8/0xf0 [ 60.316583] invokesyscall+0x44/0x108 [ 60.320334] el0svccommon.constprop.0+0xcc/0xf0 [ 60.325038] doel0svc+0x2c/0xb8 [ 60.328351] el0svc+0x2c/0x88 [ 60.331406] el0t64synchandler+0xb8/0xc0 [ 60.335587] el0t64sync+0x18c/0x190 [ 60.339251] Code: 52800013 d2e00414 35fff45c d503201f (d4210000) [ 60.345344] ---[ end trace 0000000000000000 ]---

To fix it, this patch adds a checking the payload length if it is zero.