Ian Abbott 238b5ad855 staging: comedi: fix memory leak / bad pointer freeing for chanlist ... As a follow-up to commit 6cab7a37f5 ("staging: comedi: (regression) channel list must be set for COMEDI_CMD ioctl"), Hartley Sweeten pointed out another couple of bugs stemming from commit 6cab7a37f5 ("staging: comedi: comedi_fops: introduce __comedi_get_user_chanlist()"). Firstly, `do_cmdtest_ioctl()` never frees the kernel copy of the user chanlist allocated by `__comedi_get_user_chanlist()`, so that memory is leaked. Fix it by freeing the allocated kernel memory pointed to by `cmd.chanlist` before that pointer is overwritten with its original pointer to user memory before `cmd` is copied back to user-space. Secondly, if `__comedi_get_user_chanlist()` returns an error, `cmd->chanlist` is left unchanged and in fact will be a pointer to user memory. This causes `do_cmd_ioctl()` to `goto cleanup` and call `do_become_nonbusy()` which would attempt to free the memory pointed to by the user-space pointer. Fix it by setting `cmd->chanlist` to NULL at the start of `__comedi_get_user_chanlist()`. Fixes: c6cd0eefb2 ("staging: comedi: comedi_fops: introduce __comedi_get_user_chanlist()") Reported-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: <stable@vger.kernel.org> # 3.15.y 3.16.y 3.17.y: 6cab7a37f5 Cc: <stable@vger.kernel.org> # 3.15.y 3.16.y 3.17.y Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2014-10-29 16:18:31 +08:00
..
drivers	staging: comedi: ni_usb6501: add counter subdevice	2014-09-19 15:58:18 -07:00
kcomedilib	…
Kconfig	staging: comedi: Kconfig: fix config COMEDI_ADDI_APCI_3120 dependants	2014-10-29 16:18:31 +08:00
Makefile	…
TODO	…
comedi.h	staging: comedi: add CMDF_ROUND_... as synonyms for TRIG_ROUND_...	2014-09-08 13:50:14 -07:00
comedi_buf.c	staging: comedi: migrate copyrights from "comedi_fc.c"	2014-09-19 15:55:32 -07:00
comedi_compat32.c	staging: comedi: comedi_compat32: checkpatch.pl --strict cleanup	2014-07-18 16:10:39 -07:00
comedi_compat32.h	staging: comedi: comedi_compat32.h: checkpatch.pl --strict cleanup	2014-07-18 16:10:40 -07:00
comedi_fops.c	staging: comedi: fix memory leak / bad pointer freeing for chanlist	2014-10-29 16:18:31 +08:00
comedi_internal.h	staging: comedi: comedi_internal.h: checkpatch.pl --strict cleanup	2014-07-18 16:10:39 -07:00
comedi_pci.c	staging: comedi: comedi_pci: introduce comedi_pci_detach()	2014-08-30 13:24:54 -07:00
comedi_pcmcia.c	…
comedi_usb.c	…
comedidev.h	staging: comedi: add comedi_read_array_from_buffer()	2014-09-19 15:55:32 -07:00
comedilib.h	…
drivers.c	staging: comedi: migrate copyrights from "comedi_fc.c"	2014-09-19 15:55:32 -07:00
proc.c	…
range.c	…