usb: cdc-wdm: close race between read and workqueue

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commit 339f83612f upstream.

wdm_read() cannot race with itself. However, in
service_outstanding_interrupt() it can race with the
workqueue, which can be triggered by error handling.

Hence we need to make sure that the WDM_RESPONDING
flag is not just only set but tested.

Fixes: afba937e54 ("USB: CDC WDM driver")
Cc: stable <stable@kernel.org>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
Link: https://lore.kernel.org/r/20240314115132.3907-1-oneukum@suse.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Oliver Neukum 2024-03-14 12:50:48 +01:00 • committed by Greg Kroah-Hartman

parent 181f92abda

commit 916cd2fcbc

1 changed files with 5 additions and 1 deletions

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drivers/usb/class/cdc-wdm.c

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