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Date: Wed, 26 Jun 2019 22:25:30 -0500
From: Jiunn Chang <c0d1n61at3@...il.com>
To: skhan@...uxfoundation.org
Cc: linux-kernel-mentees@...ts.linuxfoundation.org,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
davem@...emloft.net
Subject: [Linux-kernel-mentees][PATCH v2] packet: Fix undefined behavior in bit shift
Shifting signed 32-bit value by 31 bits is undefined. Changing most
significant bit to unsigned.
Changes included in v2:
- use subsystem specific subject lines
- CC required mailing lists
Signed-off-by: Jiunn Chang <c0d1n61at3@...il.com>
---
include/uapi/linux/if_packet.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/uapi/linux/if_packet.h b/include/uapi/linux/if_packet.h
index 467b654bd4c7..3d884d68eb30 100644
--- a/include/uapi/linux/if_packet.h
+++ b/include/uapi/linux/if_packet.h
@@ -123,7 +123,7 @@ struct tpacket_auxdata {
/* Rx and Tx ring - header status */
#define TP_STATUS_TS_SOFTWARE (1 << 29)
#define TP_STATUS_TS_SYS_HARDWARE (1 << 30) /* deprecated, never set */
-#define TP_STATUS_TS_RAW_HARDWARE (1 << 31)
+#define TP_STATUS_TS_RAW_HARDWARE (1U << 31)
/* Rx ring - feature request bits */
#define TP_FT_REQ_FILL_RXHASH 0x1
--
2.22.0
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