[PATCH] fastboot: handle error from file_list_parse()

[Rouven Czerwinski]

On Wed, 2021-07-21 at 10:03 +0200, Ahmad Fatoum wrote:
> Hello Rouven,
> 
> On 21.07.21 09:50, Rouven Czerwinski wrote:
> > In case an invalid file list is passed to file_list_parse(), it will
> > return an error, i.e. by passing "/dev/mmc1(emmc) /dev/mmc1.1(root)",
> > the error here being that the entries are not comma separated and
> > file_list_parse will try to parse ' ' as a flag. The fastboot code
> > didn't handle this, leading to the following error:
> > 
> >   ERROR: file_list: Unknown flag ' '
> >   ERROR: file_list: parse error
> >   unable to handle paging request at address 0xfffffff2
> >   pc : [<8fe26a20>]    lr : [<8fe0f965>]
> >   sp : 8ffeff50  ip : 8ffef714  fp : 00079bda
> >   r10: 001b9ff8  r9 : 8fea7eec  r8 : 00000001
> >   r7 : 00000000  r6 : 00000001  r5 : 00000000  r4 : 8813eab0
> >   r3 : ffffffea  r2 : 00020000  r1 : 00000001  r0 : 8813eab0
> >   Flags: nzCv  IRQs off  FIQs off  Mode SVC_32
> >   WARNING: [<8fe26a20>] (usb_multi_count_functions+0xc/0x2a) from [<8fe0f965>] (usbgadget_register+0x79/0xf4)
> >   WARNING: [<8fe0f965>] (usbgadget_register+0x79/0xf4) from [<8fe0fa13>] (usbgadget_autostart_set+0x33/0x4c)
> >   WARNING: [<8fe0fa13>] (usbgadget_autostart_set+0x33/0x4c) from [<8fe4d437>] (param_int_set+0x4b/0xb0)
> >   WARNING: [<8fe4d437>] (param_int_set+0x4b/0xb0) from [<8fe4d899>] (dev_set_param+0x4d/0x64)
> >   WARNING: [<8fe4d899>] (dev_set_param+0x4d/0x64) from [<8fe066f1>] (globalvar_add_bool+0x49/0x54)
> >   WARNING: [<8fe066f1>] (globalvar_add_bool+0x49/0x54) from [<8fe0f8dd>] (usbgadget_autostart_init+0x15/0x24)
> >   WARNING: [<8fe0f8dd>] (usbgadget_autostart_init+0x15/0x24) from [<8fe01081>] (start_barebox+0x35/0x6c)
> >   WARNING: [<8fe01081>] (start_barebox+0x35/0x6c) from [<8fe62ed9>] (barebox_non_pbl_start+0x121/0x164)
> >   WARNING: [<8fe62ed9>] (barebox_non_pbl_start+0x121/0x164) from [<8fe00005>] (__bare_init_start+0x1/0xc)
> > 
> >   WARNING: [<8fe64e3d>] (unwind_backtrace+0x1/0x78) from [<8fe01385>] (panic+0x1d/0x34)
> >   WARNING: [<8fe01385>] (panic+0x1d/0x34) from [<8fe62723>] (do_exception+0xf/0x14)
> >   WARNING: [<8fe62723>] (do_exception+0xf/0x14) from [<8fe62791>] (do_data_abort+0x21/0x34)
> >   WARNING: [<8fe62791>] (do_data_abort+0x21/0x34) from [<8fe624d4>] (do_abort_6+0x48/0x54)
> > 
> > Add the proper error handling and notify the user with a proper error message.
> 
> get_dfu_function() suffers from the same issue. There is already a parse function in
> common/usbgadget.c that warns and returns NULL. Could you move that somewhere
> central and use it for both fastboot and dfu?

Sounds good, I send an updated patch series to the list which moves the
parse function to file-list.h and renames it to file_list_parse_null().

Regards,
Rouven