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usb: gadget: gserial: check if console kthread exists

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Check for bad pointer that may result because of kthread_create failure.
This check is needed since the gserial setup callback function
(gs_console_setup()) is only freeing the info->con_buf in case of
kthread_create failure which will result into bad info->console_thread
pointer.
Without checking info->console_thread pointer validity in the
gserial_console_exit() function, before calling kthread_stop(), the
rmmod will generate Kernel Oops.

Signed-off-by: Bogdan Mirea <Bogdan-Stefan_mirea@mentor.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Bogdan Mirea 2017-04-30 13:21:26 +03:00 committed by Felipe Balbi
parent d325a1de49
commit 844cf8a9d5
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/gadget/function/u_serial.c
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@ -1256,7 +1256,7 @@ static void gserial_console_exit(void)
struct gscons_info *info = &gscons_info; struct gscons_info *info = &gscons_info;
unregister_console(&gserial_cons); unregister_console(&gserial_cons);
if (info->console_thread != NULL) if (!IS_ERR_OR_NULL(info->console_thread))
kthread_stop(info->console_thread); kthread_stop(info->console_thread);
gs_buf_free(&info->con_buf); gs_buf_free(&info->con_buf);
} }