diff mbox

[v2] arcmsr: buffer overflow in arcmsr_iop_message_xfer()

Message ID 20160915134456.GA30277@mwanda (mailing list archive)
State Accepted, archived
Headers show

Commit Message

Dan Carpenter Sept. 15, 2016, 1:44 p.m. UTC 
We need to put an upper bound on "user_len" so the memcpy() doesn't
overflow.

Reported-by: Marco Grassi <marco.gra@gmail.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>

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Comments

Martin K. Petersen Sept. 15, 2016, 1:59 p.m. UTC | #1 
>>>>> "Dan" == Dan Carpenter <dan.carpenter@oracle.com> writes:

Dan> We need to put an upper bound on "user_len" so the memcpy() doesn't
Dan> overflow.

Applied to 4.9/scsi-queue.
diff mbox

Patch

diff --git a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c
index 7640498..110eca9 100644
--- a/drivers/scsi/arcmsr/arcmsr_hba.c
+++ b/drivers/scsi/arcmsr/arcmsr_hba.c
@@ -2388,7 +2388,8 @@  static int arcmsr_iop_message_xfer(struct AdapterControlBlock *acb,
 	}
 	case ARCMSR_MESSAGE_WRITE_WQBUFFER: {
 		unsigned char *ver_addr;
-		int32_t user_len, cnt2end;
+		uint32_t user_len;
+		int32_t cnt2end;
 		uint8_t *pQbuffer, *ptmpuserbuffer;
 		ver_addr = kmalloc(ARCMSR_API_DATA_BUFLEN, GFP_ATOMIC);
 		if (!ver_addr) {
@@ -2397,6 +2398,11 @@  static int arcmsr_iop_message_xfer(struct AdapterControlBlock *acb,
 		}
 		ptmpuserbuffer = ver_addr;
 		user_len = pcmdmessagefld->cmdmessage.Length;
+		if (user_len > ARCMSR_API_DATA_BUFLEN) {
+			retvalue = ARCMSR_MESSAGE_FAIL;
+			kfree(ver_addr);
+			goto message_out;
+		}
 		memcpy(ptmpuserbuffer,
 			pcmdmessagefld->messagedatabuffer, user_len);
 		spin_lock_irqsave(&acb->wqbuffer_lock, flags);