linux-kernel - [PATCH 3.16 05/87] scsi: bnx2fc: fix incorrect cast to u64 on shift operation

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Message-ID: <lsq.1570043211.850770727@decadent.org.uk>
Date:   Wed, 02 Oct 2019 20:06:51 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Saurav Kashyap" <skashyap@...vell.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "Colin Ian King" <colin.king@...onical.com>
Subject: [PATCH 3.16 05/87] scsi: bnx2fc: fix incorrect cast to u64 on
 shift operation

3.16.75-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Colin Ian King <colin.king@...onical.com>

commit d0c0d902339249c75da85fd9257a86cbb98dfaa5 upstream.

Currently an int is being shifted and the result is being cast to a u64
which leads to undefined behaviour if the shift is more than 31 bits. Fix
this by casting the integer value 1 to u64 before the shift operation.

Addresses-Coverity: ("Bad shift operation")
Fixes: 7b594769120b ("[SCSI] bnx2fc: Handle REC_TOV error code from firmware")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
Acked-by: Saurav Kashyap <skashyap@...vell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/scsi/bnx2fc/bnx2fc_hwi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/bnx2fc/bnx2fc_hwi.c
+++ b/drivers/scsi/bnx2fc/bnx2fc_hwi.c
@@ -828,7 +828,7 @@ ret_err_rqe:
 			((u64)err_entry->data.err_warn_bitmap_hi << 32) |
 			(u64)err_entry->data.err_warn_bitmap_lo;
 		for (i = 0; i < BNX2FC_NUM_ERR_BITS; i++) {
-			if (err_warn_bit_map & (u64) (1 << i)) {
+			if (err_warn_bit_map & ((u64)1 << i)) {
 				err_warn = i;
 				break;
 			}