From: Swen Schillig Date: Wed, 17 Nov 2010 13:23:43 +0000 (+0100) Subject: [SCSI] zfcp: Prevent usage w/o holding a reference X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=14718e3cd8e9c6937114cebbf3ce5d504328da8c;p=linux-beck.git [SCSI] zfcp: Prevent usage w/o holding a reference The ERP got values assigned for which no reference was taken. This can lead to an unpredictable race condition. Fix this by only assigning the values which are required and for which a reference was pulled or is held implicitly. Signed-off-by: Swen Schillig Signed-off-by: Christof Schmitt Signed-off-by: James Bottomley --- diff --git a/drivers/s390/scsi/zfcp_erp.c b/drivers/s390/scsi/zfcp_erp.c index 63422c13c7da..0bcd5806bd9a 100644 --- a/drivers/s390/scsi/zfcp_erp.c +++ b/drivers/s390/scsi/zfcp_erp.c @@ -190,6 +190,9 @@ static struct zfcp_erp_action *zfcp_erp_setup_act(int need, u32 act_status, atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &zfcp_sdev->status); erp_action = &zfcp_sdev->erp_action; + memset(erp_action, 0, sizeof(struct zfcp_erp_action)); + erp_action->port = port; + erp_action->sdev = sdev; if (!(atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_RUNNING)) act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY; @@ -202,6 +205,8 @@ static struct zfcp_erp_action *zfcp_erp_setup_act(int need, u32 act_status, zfcp_erp_action_dismiss_port(port); atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status); erp_action = &port->erp_action; + memset(erp_action, 0, sizeof(struct zfcp_erp_action)); + erp_action->port = port; if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_RUNNING)) act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY; break; @@ -211,6 +216,7 @@ static struct zfcp_erp_action *zfcp_erp_setup_act(int need, u32 act_status, zfcp_erp_action_dismiss_adapter(adapter); atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status); erp_action = &adapter->erp_action; + memset(erp_action, 0, sizeof(struct zfcp_erp_action)); if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_RUNNING)) act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY; @@ -220,10 +226,7 @@ static struct zfcp_erp_action *zfcp_erp_setup_act(int need, u32 act_status, return NULL; } - memset(erp_action, 0, sizeof(struct zfcp_erp_action)); erp_action->adapter = adapter; - erp_action->port = port; - erp_action->sdev = sdev; erp_action->action = need; erp_action->status = act_status;