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[2/2] coresight: etm4x: Fix bit shifting

Message ID 1520961871-11196-3-git-send-email-mathieu.poirier@linaro.org (mailing list archive)
State New, archived
Headers show

Commit Message

Mathieu Poirier March 13, 2018, 5:24 p.m. UTC 
From: Bo Yan <byan@nvidia.com>

ctxid_pid and vmid_val in config are of type u64. When an integer
0xFF is being left shifted more than 32 bits, the behavior is
undefined. The fix is to specify 0xFF as an unsigned long.

Detected by Coverity scan: CID 37650, 37651 (Bad bit shift operation)

Signed-off-by: Bo Yan <byan@nvidia.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
---
 drivers/hwtracing/coresight/coresight-etm4x-sysfs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
index 4e6eab53e34e..d21961710713 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
@@ -1780,7 +1780,7 @@  static ssize_t ctxid_masks_store(struct device *dev,
 		 */
 		for (j = 0; j < 8; j++) {
 			if (maskbyte & 1)
-				config->ctxid_pid[i] &= ~(0xFF << (j * 8));
+				config->ctxid_pid[i] &= ~(0xFFUL << (j * 8));
 			maskbyte >>= 1;
 		}
 		/* Select the next ctxid comparator mask value */
@@ -1963,7 +1963,7 @@  static ssize_t vmid_masks_store(struct device *dev,
 		 */
 		for (j = 0; j < 8; j++) {
 			if (maskbyte & 1)
-				config->vmid_val[i] &= ~(0xFF << (j * 8));
+				config->vmid_val[i] &= ~(0xFFUL << (j * 8));
 			maskbyte >>= 1;
 		}
 		/* Select the next vmid comparator mask value */