scsi: 3w-xxxx: Replace one-element array with flexible-array member
One-element arrays are deprecated, and we are replacing them with flexible
array members instead. So, replace one-element array with flexible-array
member in struct TAG_TW_New_Ioctl and refactor the rest of the code,
accordingly.
Notice that, in multiple places, the subtraction of 1 from
sizeof(TW_New_Ioctl) is removed, as this operation is now implicit
after the flex-array transformation.
Link: https://github.com/KSPP/linux/issues/79
Link: https://github.com/KSPP/linux/issues/206
Link: https://lore.kernel.org/r/YyyyvB30jnjRaw/F@work
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
diff --git a/drivers/scsi/3w-xxxx.c b/drivers/scsi/3w-xxxx.c
index a853c54..ffdecb1 100644
--- a/drivers/scsi/3w-xxxx.c
+++ b/drivers/scsi/3w-xxxx.c
@@ -912,7 +912,7 @@ static long tw_chrdev_ioctl(struct file *file, unsigned int cmd, unsigned long a
data_buffer_length_adjusted = (data_buffer_length + 511) & ~511;
/* Now allocate ioctl buf memory */
- cpu_addr = dma_alloc_coherent(&tw_dev->tw_pci_dev->dev, data_buffer_length_adjusted+sizeof(TW_New_Ioctl) - 1, &dma_handle, GFP_KERNEL);
+ cpu_addr = dma_alloc_coherent(&tw_dev->tw_pci_dev->dev, data_buffer_length_adjusted + sizeof(TW_New_Ioctl), &dma_handle, GFP_KERNEL);
if (cpu_addr == NULL) {
retval = -ENOMEM;
goto out;
@@ -921,7 +921,7 @@ static long tw_chrdev_ioctl(struct file *file, unsigned int cmd, unsigned long a
tw_ioctl = (TW_New_Ioctl *)cpu_addr;
/* Now copy down the entire ioctl */
- if (copy_from_user(tw_ioctl, argp, data_buffer_length + sizeof(TW_New_Ioctl) - 1))
+ if (copy_from_user(tw_ioctl, argp, data_buffer_length + sizeof(TW_New_Ioctl)))
goto out2;
passthru = (TW_Passthru *)&tw_ioctl->firmware_command;
@@ -966,15 +966,15 @@ static long tw_chrdev_ioctl(struct file *file, unsigned int cmd, unsigned long a
/* Load the sg list */
switch (TW_SGL_OUT(tw_ioctl->firmware_command.opcode__sgloffset)) {
case 2:
- tw_ioctl->firmware_command.byte8.param.sgl[0].address = dma_handle + sizeof(TW_New_Ioctl) - 1;
+ tw_ioctl->firmware_command.byte8.param.sgl[0].address = dma_handle + sizeof(TW_New_Ioctl);
tw_ioctl->firmware_command.byte8.param.sgl[0].length = data_buffer_length_adjusted;
break;
case 3:
- tw_ioctl->firmware_command.byte8.io.sgl[0].address = dma_handle + sizeof(TW_New_Ioctl) - 1;
+ tw_ioctl->firmware_command.byte8.io.sgl[0].address = dma_handle + sizeof(TW_New_Ioctl);
tw_ioctl->firmware_command.byte8.io.sgl[0].length = data_buffer_length_adjusted;
break;
case 5:
- passthru->sg_list[0].address = dma_handle + sizeof(TW_New_Ioctl) - 1;
+ passthru->sg_list[0].address = dma_handle + sizeof(TW_New_Ioctl);
passthru->sg_list[0].length = data_buffer_length_adjusted;
break;
}
@@ -1017,12 +1017,12 @@ static long tw_chrdev_ioctl(struct file *file, unsigned int cmd, unsigned long a
}
/* Now copy the response to userspace */
- if (copy_to_user(argp, tw_ioctl, sizeof(TW_New_Ioctl) + data_buffer_length - 1))
+ if (copy_to_user(argp, tw_ioctl, sizeof(TW_New_Ioctl) + data_buffer_length))
goto out2;
retval = 0;
out2:
/* Now free ioctl buf memory */
- dma_free_coherent(&tw_dev->tw_pci_dev->dev, data_buffer_length_adjusted+sizeof(TW_New_Ioctl) - 1, cpu_addr, dma_handle);
+ dma_free_coherent(&tw_dev->tw_pci_dev->dev, data_buffer_length_adjusted + sizeof(TW_New_Ioctl), cpu_addr, dma_handle);
out:
mutex_unlock(&tw_dev->ioctl_lock);
mutex_unlock(&tw_mutex);
diff --git a/drivers/scsi/3w-xxxx.h b/drivers/scsi/3w-xxxx.h
index e8f3f08..120a087 100644
--- a/drivers/scsi/3w-xxxx.h
+++ b/drivers/scsi/3w-xxxx.h
@@ -348,7 +348,7 @@ typedef struct TAG_TW_New_Ioctl {
unsigned int data_buffer_length;
unsigned char padding [508];
TW_Command firmware_command;
- char data_buffer[1];
+ char data_buffer[];
} TW_New_Ioctl;
/* GetParam descriptor */
