TLDRVuln - Cybersecurity Vulnerabilities Made Simple

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

usb: dwc3: ep0: fix NULL pointer exception

There is no validation of the index from dwc3_wIndex_to_dep() and we might

be referring a non-existing ep and trigger a NULL pointer exception. In

certain configurations we might use fewer eps and the index might wrongly

indicate a larger ep index than existing.

By adding this validation from the patch we can actually report a wrong

index back to the caller.

In our usecase we are using a composite device on an older kernel, but

upstream might use this fix also. Unfortunately, I cannot describe the

hardware for others to reproduce the issue as it is a proprietary

implementation.

[ 82.958261] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000a4

[ 82.966891] Mem abort info:

[ 82.969663] ESR = 0x96000006

[ 82.972703] Exception class = DABT (current EL), IL = 32 bits

[ 82.978603] SET = 0, FnV = 0

[ 82.981642] EA = 0, S1PTW = 0

[ 82.984765] Data abort info:

[ 82.987631] ISV = 0, ISS = 0x00000006

[ 82.991449] CM = 0, WnR = 0

[ 82.994409] user pgtable: 4k pages, 39-bit VAs, pgdp = 00000000c6210ccc

[ 83.000999] [00000000000000a4] pgd=0000000053aa5003, pud=0000000053aa5003, pmd=0000000000000000

[ 83.009685] Internal error: Oops: 96000006 [#1] PREEMPT SMP

[ 83.026433] Process irq/62-dwc3 (pid: 303, stack limit = 0x000000003985154c)

[ 83.033470] CPU: 0 PID: 303 Comm: irq/62-dwc3 Not tainted 4.19.124 #1

[ 83.044836] pstate: 60000085 (nZCv daIf -PAN -UAO)

[ 83.049628] pc : dwc3_ep0_handle_feature+0x414/0x43c

[ 83.054558] lr : dwc3_ep0_interrupt+0x3b4/0xc94

...

[ 83.141788] Call trace:

[ 83.144227] dwc3_ep0_handle_feature+0x414/0x43c

[ 83.148823] dwc3_ep0_interrupt+0x3b4/0xc94

[ 83.181546] ---[ end trace aac6b5267d84c32f ]---