[dpdk-stable] [PATCH 03/29] net/sfc/base: fix shift by more bits than field width

[Andrew Rybchenko]

From: Mark Spender <mspender at solarflare.com>

This was probably an oversight when support for multiple sensor pages
was added.

Despite being undefined behaviour in C, it probably worked on Intel
x32/x64 as on them bit shift operations wrap round.

Fixes: dfb3b1ce15f6 ("net/sfc/base: import monitors access via MCDI")
Cc: stable at dpdk.org

Signed-off-by: Mark Spender <mspender at solarflare.com>
Signed-off-by: Andrew Rybchenko <arybchenko at solarflare.com>
---
 drivers/net/sfc/base/mcdi_mon.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/sfc/base/mcdi_mon.c b/drivers/net/sfc/base/mcdi_mon.c
index b53de0d..d0247dc 100644
--- a/drivers/net/sfc/base/mcdi_mon.c
+++ b/drivers/net/sfc/base/mcdi_mon.c
@@ -73,7 +73,8 @@
 			/* This sensor is one of the page boundary bits. */
 		}
 
-		if (~(sensor_mask[page]) & (1U << sensor))
+		if (~(sensor_mask[page]) &
+		    (1U << (sensor % (sizeof (sensor_mask[page]) * 8))))
 			continue;
 		/* This sensor not in DMA buffer */
 
-- 
1.8.3.1