ixgbe: Bounds checking for set_rar, clear_rar, set_vmdq, clear_vmdq

This change makes it so that out of bounds requests to these calls will
now return IXGBE_ERR_INVALID_ARGUMENT instead of returning 0.
Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Stephen Ko <stephen.s.ko@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ixgbe/ixgbe_82598.c

@@ -858,6 +858,13 @@ static s32 ixgbe_reset_hw_82598(struct ixgbe_hw *hw)
 static s32 ixgbe_set_vmdq_82598(struct ixgbe_hw *hw, u32 rar, u32 vmdq)
 {
 	u32 rar_high;
+	u32 rar_entries = hw->mac.num_rar_entries;
+
+	/* Make sure we are using a valid rar index range */
+	if (rar >= rar_entries) {
+		hw_dbg(hw, "RAR index %d is out of range.\n", rar);
+		return IXGBE_ERR_INVALID_ARGUMENT;
+	}
 
 	rar_high = IXGBE_READ_REG(hw, IXGBE_RAH(rar));
 	rar_high &= ~IXGBE_RAH_VIND_MASK;
@@ -877,15 +884,18 @@ static s32 ixgbe_clear_vmdq_82598(struct ixgbe_hw *hw, u32 rar, u32 vmdq)
 	u32 rar_high;
 	u32 rar_entries = hw->mac.num_rar_entries;
 
-	if (rar < rar_entries) {
+
+	/* Make sure we are using a valid rar index range */
+	if (rar >= rar_entries) {
+		hw_dbg(hw, "RAR index %d is out of range.\n", rar);
+		return IXGBE_ERR_INVALID_ARGUMENT;
+	}
+
 	rar_high = IXGBE_READ_REG(hw, IXGBE_RAH(rar));
 	if (rar_high & IXGBE_RAH_VIND_MASK) {
 		rar_high &= ~IXGBE_RAH_VIND_MASK;
 		IXGBE_WRITE_REG(hw, IXGBE_RAH(rar), rar_high);
 	}
-	} else {
-		hw_dbg(hw, "RAR index %d is out of range.\n", rar);
-	}
 
 	return 0;
 }

drivers/net/ixgbe/ixgbe_common.c

@@ -1239,11 +1239,15 @@ s32 ixgbe_set_rar_generic(struct ixgbe_hw *hw, u32 index, u8 *addr, u32 vmdq,
 	u32 rar_low, rar_high;
 	u32 rar_entries = hw->mac.num_rar_entries;
 
+	/* Make sure we are using a valid rar index range */
+	if (index >= rar_entries) {
+		hw_dbg(hw, "RAR index %d is out of range.\n", index);
+		return IXGBE_ERR_INVALID_ARGUMENT;
+	}
+
 	/* setup VMDq pool selection before this RAR gets enabled */
 	hw->mac.ops.set_vmdq(hw, index, vmdq);
 
-	/* Make sure we are using a valid rar index range */
-	if (index < rar_entries) {
 	/*
 	 * HW expects these in little endian so we reverse the byte
 	 * order from network order (big endian) to little endian
@@ -1266,10 +1270,6 @@ s32 ixgbe_set_rar_generic(struct ixgbe_hw *hw, u32 index, u8 *addr, u32 vmdq,
 
 	IXGBE_WRITE_REG(hw, IXGBE_RAL(index), rar_low);
 	IXGBE_WRITE_REG(hw, IXGBE_RAH(index), rar_high);
-	} else {
-		hw_dbg(hw, "RAR index %d is out of range.\n", index);
-		return IXGBE_ERR_RAR_INDEX;
-	}
 
 	return 0;
 }
@@ -1287,7 +1287,11 @@ s32 ixgbe_clear_rar_generic(struct ixgbe_hw *hw, u32 index)
 	u32 rar_entries = hw->mac.num_rar_entries;
 
 	/* Make sure we are using a valid rar index range */
-	if (index < rar_entries) {
+	if (index >= rar_entries) {
+		hw_dbg(hw, "RAR index %d is out of range.\n", index);
+		return IXGBE_ERR_INVALID_ARGUMENT;
+	}
+
 	/*
 	 * Some parts put the VMDq setting in the extra RAH bits,
 	 * so save everything except the lower 16 bits that hold part
@@ -1298,10 +1302,6 @@ s32 ixgbe_clear_rar_generic(struct ixgbe_hw *hw, u32 index)
 
 	IXGBE_WRITE_REG(hw, IXGBE_RAL(index), 0);
 	IXGBE_WRITE_REG(hw, IXGBE_RAH(index), rar_high);
-	} else {
-		hw_dbg(hw, "RAR index %d is out of range.\n", index);
-		return IXGBE_ERR_RAR_INDEX;
-	}
 
 	/* clear VMDq pool/queue selection for this RAR */
 	hw->mac.ops.clear_vmdq(hw, index, IXGBE_CLEAR_VMDQ_ALL);
@@ -2468,7 +2468,12 @@ s32 ixgbe_clear_vmdq_generic(struct ixgbe_hw *hw, u32 rar, u32 vmdq)
 	u32 mpsar_lo, mpsar_hi;
 	u32 rar_entries = hw->mac.num_rar_entries;
 
-	if (rar < rar_entries) {
+	/* Make sure we are using a valid rar index range */
+	if (rar >= rar_entries) {
+		hw_dbg(hw, "RAR index %d is out of range.\n", rar);
+		return IXGBE_ERR_INVALID_ARGUMENT;
+	}
+
 	mpsar_lo = IXGBE_READ_REG(hw, IXGBE_MPSAR_LO(rar));
 	mpsar_hi = IXGBE_READ_REG(hw, IXGBE_MPSAR_HI(rar));
 
@@ -2495,10 +2500,6 @@ s32 ixgbe_clear_vmdq_generic(struct ixgbe_hw *hw, u32 rar, u32 vmdq)
 	/* was that the last pool using this rar? */
 	if (mpsar_lo == 0 && mpsar_hi == 0 && rar != 0)
 		hw->mac.ops.clear_rar(hw, rar);
-	} else {
-		hw_dbg(hw, "RAR index %d is out of range.\n", rar);
-	}
-
 done:
 	return 0;
 }
@@ -2514,7 +2515,12 @@ s32 ixgbe_set_vmdq_generic(struct ixgbe_hw *hw, u32 rar, u32 vmdq)
 	u32 mpsar;
 	u32 rar_entries = hw->mac.num_rar_entries;
 
-	if (rar < rar_entries) {
+	/* Make sure we are using a valid rar index range */
+	if (rar >= rar_entries) {
+		hw_dbg(hw, "RAR index %d is out of range.\n", rar);
+		return IXGBE_ERR_INVALID_ARGUMENT;
+	}
+
 	if (vmdq < 32) {
 		mpsar = IXGBE_READ_REG(hw, IXGBE_MPSAR_LO(rar));
 		mpsar |= 1 << vmdq;
@@ -2524,9 +2530,6 @@ s32 ixgbe_set_vmdq_generic(struct ixgbe_hw *hw, u32 rar, u32 vmdq)
 		mpsar |= 1 << (vmdq - 32);
 		IXGBE_WRITE_REG(hw, IXGBE_MPSAR_HI(rar), mpsar);
 	}
-	} else {
-		hw_dbg(hw, "RAR index %d is out of range.\n", rar);
-	}
 	return 0;
 }
 

drivers/net/ixgbe/ixgbe_type.h

@@ -2689,7 +2689,6 @@ struct ixgbe_info {
 #define IXGBE_ERR_EEPROM_VERSION                -24
 #define IXGBE_ERR_NO_SPACE                      -25
 #define IXGBE_ERR_OVERTEMP                      -26
-#define IXGBE_ERR_RAR_INDEX                     -27
 #define IXGBE_ERR_SFP_SETUP_NOT_COMPLETE        -30
 #define IXGBE_ERR_PBA_SECTION                   -31
 #define IXGBE_ERR_INVALID_ARGUMENT              -32