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serial: icom: move array overflow checks earlier

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This code does an annoying thing where it writes to the array and then
checks later for array overflows.  I don't know if it's actually
possible to overflow but let's check before using the array index.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2013-08-26 18:10:01 +03:00 committed by Greg Kroah-Hartman
parent 1b2a405bba
commit 4f03ffcd3e
1 changed files with 48 additions and 41 deletions
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89
drivers/tty/serial/icom.c
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@ -297,25 +297,25 @@ static void stop_processor(struct icom_port *icom_port)
spin_lock_irqsave(&icom_lock, flags);
port = icom_port->port;
if (port >= ARRAY_SIZE(stop_proc)) {
dev_err(&icom_port->adapter->pci_dev->dev,
"Invalid port assignment\n");
goto unlock;
}
if (port == 0 || port == 1)
stop_proc[port].global_control_reg = &icom_port->global_reg->control;
else
stop_proc[port].global_control_reg = &icom_port->global_reg->control_2;
temp = readl(stop_proc[port].global_control_reg);
temp = (temp & ~start_proc[port].processor_id) | stop_proc[port].processor_id;
writel(temp, stop_proc[port].global_control_reg);
if (port < 4) {
temp = readl(stop_proc[port].global_control_reg);
temp =
(temp & ~start_proc[port].processor_id) | stop_proc[port].processor_id;
writel(temp, stop_proc[port].global_control_reg);
/* write flush */
readl(stop_proc[port].global_control_reg);
} else {
dev_err(&icom_port->adapter->pci_dev->dev,
"Invalid port assignment\n");
}
/* write flush */
readl(stop_proc[port].global_control_reg);
unlock:
spin_unlock_irqrestore(&icom_lock, flags);
}
@ -328,23 +328,25 @@ static void start_processor(struct icom_port *icom_port)
spin_lock_irqsave(&icom_lock, flags);
port = icom_port->port;
if (port >= ARRAY_SIZE(start_proc)) {
dev_err(&icom_port->adapter->pci_dev->dev,
"Invalid port assignment\n");
goto unlock;
}
if (port == 0 || port == 1)
start_proc[port].global_control_reg = &icom_port->global_reg->control;
else
start_proc[port].global_control_reg = &icom_port->global_reg->control_2;
if (port < 4) {
temp = readl(start_proc[port].global_control_reg);
temp =
(temp & ~stop_proc[port].processor_id) | start_proc[port].processor_id;
writel(temp, start_proc[port].global_control_reg);
/* write flush */
readl(start_proc[port].global_control_reg);
} else {
dev_err(&icom_port->adapter->pci_dev->dev,
"Invalid port assignment\n");
}
temp = readl(start_proc[port].global_control_reg);
temp = (temp & ~stop_proc[port].processor_id) | start_proc[port].processor_id;
writel(temp, start_proc[port].global_control_reg);
/* write flush */
readl(start_proc[port].global_control_reg);
unlock:
spin_unlock_irqrestore(&icom_lock, flags);
}
@ -557,6 +559,12 @@ static int startup(struct icom_port *icom_port)
*/
spin_lock_irqsave(&icom_lock, flags);
port = icom_port->port;
if (port >= ARRAY_SIZE(int_mask_tbl)) {
dev_err(&icom_port->adapter->pci_dev->dev,
"Invalid port assignment\n");
goto unlock;
}
if (port == 0 || port == 1)
int_mask_tbl[port].global_int_mask = &icom_port->global_reg->int_mask;
else
@ -566,17 +574,14 @@ static int startup(struct icom_port *icom_port)
writew(0x00FF, icom_port->int_reg);
else
writew(0x3F00, icom_port->int_reg);
if (port < 4) {
temp = readl(int_mask_tbl[port].global_int_mask);
writel(temp & ~int_mask_tbl[port].processor_id, int_mask_tbl[port].global_int_mask);
/* write flush */
readl(int_mask_tbl[port].global_int_mask);
} else {
dev_err(&icom_port->adapter->pci_dev->dev,
"Invalid port assignment\n");
}
temp = readl(int_mask_tbl[port].global_int_mask);
writel(temp & ~int_mask_tbl[port].processor_id, int_mask_tbl[port].global_int_mask);
/* write flush */
readl(int_mask_tbl[port].global_int_mask);
unlock:
spin_unlock_irqrestore(&icom_lock, flags);
return 0;
}
@ -595,21 +600,23 @@ static void shutdown(struct icom_port *icom_port)
* disable all interrupts
*/
port = icom_port->port;
if (port >= ARRAY_SIZE(int_mask_tbl)) {
dev_err(&icom_port->adapter->pci_dev->dev,
"Invalid port assignment\n");
goto unlock;
}
if (port == 0 || port == 1)
int_mask_tbl[port].global_int_mask = &icom_port->global_reg->int_mask;
else
int_mask_tbl[port].global_int_mask = &icom_port->global_reg->int_mask_2;
if (port < 4) {
temp = readl(int_mask_tbl[port].global_int_mask);
writel(temp | int_mask_tbl[port].processor_id, int_mask_tbl[port].global_int_mask);
temp = readl(int_mask_tbl[port].global_int_mask);
writel(temp | int_mask_tbl[port].processor_id, int_mask_tbl[port].global_int_mask);
/* write flush */
readl(int_mask_tbl[port].global_int_mask);
} else {
dev_err(&icom_port->adapter->pci_dev->dev,
"Invalid port assignment\n");
}
/* write flush */
readl(int_mask_tbl[port].global_int_mask);
unlock:
spin_unlock_irqrestore(&icom_lock, flags);
/*