[PATCH 4.19 17/23] bnxt_en: Fix uninitialized variable usage in bnxt_rx_pkt().

Greg Kroah-Hartman
2019-05-04T10:27:28Z

From: Michael Chan <michael.chan@broadcom.com>

[ Upstream commit 0b397b17a4120cb80f7bf89eb30587b3dd9b0d1d ]

In bnxt_rx_pkt(), if the driver encounters BD errors, it will recycle
the buffers and jump to the end where the uninitailized variable "len"
is referenced. Fix it by adding a new jump label that will skip
the length update. This is the most correct fix since the length
may not be valid when we get this type of error.

Fixes: 6a8788f25625 ("bnxt_en: add support for software dynamic interrupt moderation")
Reported-by: Nathan Chancellor <natechancellor@gmail.com>
Cc: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Tested-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/broadcom/bnxt/bnxt.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)

--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -1584,7 +1584,7 @@ static int bnxt_rx_pkt(struct bnxt *bp,
netdev_warn(bp->dev, "RX buffer error %x\n", rx_err);
bnxt_sched_reset(bp, rxr);
}
- goto next_rx;
+ goto next_rx_no_len;
}

len = le32_to_cpu(rxcmp->rx_cmp_len_flags_type) >> RX_CMP_LEN_SHIFT;
@@ -1665,12 +1665,13 @@ static int bnxt_rx_pkt(struct bnxt *bp,
rc = 1;

next_rx:
- rxr->rx_prod = NEXT_RX(prod);
- rxr->rx_next_cons = NEXT_RX(cons);
-
cpr->rx_packets += 1;
cpr->rx_bytes += len;

+next_rx_no_len:
+ rxr->rx_prod = NEXT_RX(prod);
+ rxr->rx_next_cons = NEXT_RX(cons);
+
next_rx_no_prod_no_len:
*raw_cons = tmp_raw_cons;