From 3a2d3d213d7c9bb427cc5bdb0de34fe18a22363e Mon Sep 17 00:00:00 2001 From: Oleksandr Kozaruk Date: Thu, 29 Aug 2013 10:55:48 +0300 Subject: [PATCH] drivers: misc: ti-st: fix potential race if st_kim_start fails 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 Signed-off-by: Greg Kroah-Hartman --- drivers/misc/ti-st/st_core.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/misc/ti-st/st_core.c b/drivers/misc/ti-st/st_core.c index 0a1428016350..8d64b681dd93 100644 --- a/drivers/misc/ti-st/st_core.c +++ b/drivers/misc/ti-st/st_core.c @@ -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;