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Subject[PATCH] DAC960.c - Null ptr fixes
Date
Hi,
Using the Stanford checker, we searched for null-pointer bugs in the linux
kernel code. This patch fixes numerous unchecked pointers in the DAC960
driver (DAC960.c).

Praveen Srinivasan and Frederick Akalin


--- ../linux/./drivers/block/DAC960.c Tue Feb 20 21:26:22 2001
+++ ./drivers/block/DAC960.c Mon May 7 21:56:30 2001
@@ -508,6 +508,9 @@
DAC960_Command_T *Command = DAC960_AllocateCommand(Controller);
DAC960_V1_CommandMailbox_T *CommandMailbox = &Command->V1.CommandMailbox;
DAC960_V1_CommandStatus_T CommandStatus;
+ if(Command == NULL) {
+ return 0;
+ }
DAC960_V1_ClearCommand(Command);
Command->CommandType = DAC960_ImmediateCommand;
CommandMailbox->Type3.CommandOpcode = CommandOpcode;
@@ -534,6 +537,9 @@
DAC960_Command_T *Command = DAC960_AllocateCommand(Controller);
DAC960_V1_CommandMailbox_T *CommandMailbox = &Command->V1.CommandMailbox;
DAC960_V1_CommandStatus_T CommandStatus;
+ if(Command == NULL) {
+ return 0;
+ }
DAC960_V1_ClearCommand(Command);
Command->CommandType = DAC960_ImmediateCommand;
CommandMailbox->Type3D.CommandOpcode = CommandOpcode;
@@ -561,6 +567,9 @@
DAC960_Command_T *Command = DAC960_AllocateCommand(Controller);
DAC960_V2_CommandMailbox_T *CommandMailbox = &Command->V2.CommandMailbox;
DAC960_V2_CommandStatus_T CommandStatus;
+ if(Command == NULL) {
+ return 0;
+ }
DAC960_V2_ClearCommand(Command);
Command->CommandType = DAC960_ImmediateCommand;
CommandMailbox->Common.CommandOpcode = DAC960_V2_IOCTL;
@@ -599,6 +608,9 @@
DAC960_Command_T *Command = DAC960_AllocateCommand(Controller);
DAC960_V2_CommandMailbox_T *CommandMailbox = &Command->V2.CommandMailbox;
DAC960_V2_CommandStatus_T CommandStatus;
+ if(Command == NULL) {
+ return 0;
+ }
DAC960_V2_ClearCommand(Command);
Command->CommandType = DAC960_ImmediateCommand;
CommandMailbox->ControllerInfo.CommandOpcode = DAC960_V2_IOCTL;
@@ -641,6 +653,9 @@
DAC960_Command_T *Command = DAC960_AllocateCommand(Controller);
DAC960_V2_CommandMailbox_T *CommandMailbox = &Command->V2.CommandMailbox;
DAC960_V2_CommandStatus_T CommandStatus;
+ if(Command == NULL) {
+ return 0;
+ }
DAC960_V2_ClearCommand(Command);
Command->CommandType = DAC960_ImmediateCommand;
CommandMailbox->LogicalDeviceInfo.CommandOpcode = DAC960_V2_IOCTL;
@@ -685,6 +700,9 @@
DAC960_Command_T *Command = DAC960_AllocateCommand(Controller);
DAC960_V2_CommandMailbox_T *CommandMailbox = &Command->V2.CommandMailbox;
DAC960_V2_CommandStatus_T CommandStatus;
+ if(Command == NULL) {
+ return 0;
+ }
DAC960_V2_ClearCommand(Command);
Command->CommandType = DAC960_ImmediateCommand;
CommandMailbox->PhysicalDeviceInfo.CommandOpcode = DAC960_V2_IOCTL;
@@ -726,6 +744,9 @@
DAC960_Command_T *Command = DAC960_AllocateCommand(Controller);
DAC960_V2_CommandMailbox_T *CommandMailbox = &Command->V2.CommandMailbox;
DAC960_V2_CommandStatus_T CommandStatus;
+ if(Command == NULL) {
+ return 0;
+ }
DAC960_V2_ClearCommand(Command);
Command->CommandType = DAC960_ImmediateCommand;
CommandMailbox->DeviceOperation.CommandOpcode = DAC960_V2_IOCTL;
@@ -1435,8 +1456,12 @@
InquiryUnitSerialNumber;
memset(InquiryUnitSerialNumber, 0,
sizeof(DAC960_SCSI_Inquiry_UnitSerialNumber_T));
- InquiryUnitSerialNumber->PeripheralDeviceType = 0x1F;
+ InquiryUnitSerialNumber->PeripheralDeviceType = 0x1F;
Command = DAC960_AllocateCommand(Controller);
+ if(Command == NULL) {
+ return 0;
+ }
+
CommandMailbox = &Command->V2.CommandMailbox;
DAC960_V2_ClearCommand(Command);
Command->CommandType = DAC960_ImmediateCommand;
@@ -6594,6 +6619,10 @@
create_proc_read_entry("user_command", S_IWUSR | S_IRUSR,
ControllerProcEntry, DAC960_ProcReadUserCommand,
Controller);
+ if(UserCommandProcEntry == NULL) {
+ return 0;
+ }
+
UserCommandProcEntry->write_proc = DAC960_ProcWriteUserCommand;
Controller->ControllerProcEntry = ControllerProcEntry;
}
-
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