git: 36465977968f - stable/15 - ixgbe: avoid signed overflow in pause time calculation

The branch stable/15 has been updated by kbowling:

URL: https://cgit.FreeBSD.org/src/commit/?id=36465977968f8cc5270d25b603e0a03fcae093d2

commit 36465977968f8cc5270d25b603e0a03fcae093d2
Author:     Kevin Bowling <[email protected]>
AuthorDate: 2026-07-28 11:10:09 +0000
Commit:     Kevin Bowling <[email protected]>
CommitDate: 2026-08-08 00:36:04 +0000

    ixgbe: avoid signed overflow in pause time calculation
    
    pause_time is promoted to signed int before multiplication.  Its default
    value of 65535 multiplied by 65537 exceeds INT_MAX and triggers UBSAN,
    even though the result is assigned to a u32.
    
    Make the multiplier unsigned so the calculation has the intended u32
    semantics.  Linux commit 3b70683fc4d6 reported the failure in the generic
    path and used the same mechanical correction.  The 82598-specific flow
    control operation contains the identical expression, so correct it as well.
    
    (cherry picked from commit 35374c3ec69aa87561431e6236706c485bdeeacc)
---
 sys/dev/ixgbe/ixgbe_82598.c  | 2 +-
 sys/dev/ixgbe/ixgbe_common.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/sys/dev/ixgbe/ixgbe_82598.c b/sys/dev/ixgbe/ixgbe_82598.c
index e32fdb8f039c..f27f263dd07f 100644
--- a/sys/dev/ixgbe/ixgbe_82598.c
+++ b/sys/dev/ixgbe/ixgbe_82598.c
@@ -535,7 +535,7 @@ s32 ixgbe_fc_enable_82598(struct ixgbe_hw *hw)
 	}
 
 	/* Configure pause time (2 TCs per register) */
-	reg = hw->fc.pause_time * 0x00010001;
+	reg = hw->fc.pause_time * 0x00010001U;
 	for (i = 0; i < (IXGBE_DCB_MAX_TRAFFIC_CLASS / 2); i++)
 		IXGBE_WRITE_REG(hw, IXGBE_FCTTV(i), reg);
 
diff --git a/sys/dev/ixgbe/ixgbe_common.c b/sys/dev/ixgbe/ixgbe_common.c
index c836ccebff0c..6495bfdecc60 100644
--- a/sys/dev/ixgbe/ixgbe_common.c
+++ b/sys/dev/ixgbe/ixgbe_common.c
@@ -2932,7 +2932,7 @@ s32 ixgbe_fc_enable_generic(struct ixgbe_hw *hw)
 	}
 
 	/* Configure pause time (2 TCs per register) */
-	reg = hw->fc.pause_time * 0x00010001;
+	reg = hw->fc.pause_time * 0x00010001U;
 	for (i = 0; i < (IXGBE_DCB_MAX_TRAFFIC_CLASS / 2); i++)
 		IXGBE_WRITE_REG(hw, IXGBE_FCTTV(i), reg);