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drivers: misc: ti-st: fix potential race if st_kim_start fails

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If st_kim_start() fails registered protocols should be removed. This is
done by calling st_reg_complete(), which as comment states is called
with spin lock held. But in st_register() when st_kim_start fails it
is called without holding spin lock, creating possibility of concurrent
access to st_gdata data members.
Hold spin lock while calling st_reg_complete if st_kim_start() fails.

Signed-off-by: Oleksandr Kozaruk <oleksandr.kozaruk@globallogic.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oleksandr Kozaruk 2013-08-29 10:55:48 +03:00 committed by Greg Kroah-Hartman
parent 666b9adc80
commit 3a2d3d213d
1 changed files with 2 additions and 0 deletions
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2
drivers/misc/ti-st/st_core.c
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@ -562,7 +562,9 @@ long st_register(struct st_proto_s *new_proto)
if ((st_gdata->protos_registered != ST_EMPTY) &&
(test_bit(ST_REG_PENDING, &st_gdata->st_state))) {
pr_err(" KIM failure complete callback ");
spin_lock_irqsave(&st_gdata->lock, flags);
st_reg_complete(st_gdata, err);
spin_unlock_irqrestore(&st_gdata->lock, flags);
clear_bit(ST_REG_PENDING, &st_gdata->st_state);
}
return -EINVAL;