[lvc-project] [PATCH] net: liquidio: fix overflow in octeon_init_instr_queue()

[Alexey Nepomnyashih]

The expression `(conf->instr_type == 64) << iq_no` can overflow because
`iq_no` may be as high as 64 (`CN23XX_MAX_RINGS_PER_PF`). Casting the
operand to `u64` ensures correct 64-bit arithmetic.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Cc: stable at vger.kernel.org # v4.2+
Fixes: f21fb3ed364b ("Add support of Cavium Liquidio ethernet adapters")
Signed-off-by: Alexey Nepomnyashih <sdl at nppct.ru>
---
 drivers/net/ethernet/cavium/liquidio/request_manager.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/cavium/liquidio/request_manager.c b/drivers/net/ethernet/cavium/liquidio/request_manager.c
index de8a6ce86ad7..12105ffb5dac 100644
--- a/drivers/net/ethernet/cavium/liquidio/request_manager.c
+++ b/drivers/net/ethernet/cavium/liquidio/request_manager.c
@@ -126,7 +126,7 @@ int octeon_init_instr_queue(struct octeon_device *oct,
 	oct->io_qmask.iq |= BIT_ULL(iq_no);
 
 	/* Set the 32B/64B mode for each input queue */
-	oct->io_qmask.iq64B |= ((conf->instr_type == 64) << iq_no);
+	oct->io_qmask.iq64B |= ((u64)(conf->instr_type == 64) << iq_no);
 	iq->iqcmd_64B = (conf->instr_type == 64);
 
 	oct->fn_list.setup_iq_regs(oct, iq_no);
-- 
2.43.0