* [PATCH] net: am65-cpsw-nuss: fix out-of-bounds access
@ 2025-03-17 11:31 Ahmad Fatoum
2025-03-17 12:27 ` Sascha Hauer
0 siblings, 1 reply; 2+ messages in thread
From: Ahmad Fatoum @ 2025-03-17 11:31 UTC (permalink / raw)
To: barebox; +Cc: Ahmad Fatoum
GCC 12.2.0 complains about am65_cpsw_recv:
drivers/net/am65-cpsw-nuss.c: In function ‘am65_cpsw_recv’:
drivers/net/am65-cpsw-nuss.c:495:30: warning: array subscript 9 is
above array bounds of ‘struct am65_cpsw_port[9]’ [-Warray-bounds]
495 | port = &common->ports[port_id];
| ~~~~~~~~~~~~~^~~~~~~~~
drivers/net/am65-cpsw-nuss.c:115:33: note: while referencing ‘ports’
115 | struct am65_cpsw_port ports[AM65_CPSW_CPSWNU_MAX_PORTS];
| ^~~~~
port_id is read from the hardware and used unsanitized to index into an
array. Rework the code, so out-of-bound access leads to an error, but
no out of bound access.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
drivers/net/am65-cpsw-nuss.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/drivers/net/am65-cpsw-nuss.c b/drivers/net/am65-cpsw-nuss.c
index f6dc811bd982..6b9432e2d4e7 100644
--- a/drivers/net/am65-cpsw-nuss.c
+++ b/drivers/net/am65-cpsw-nuss.c
@@ -466,7 +466,6 @@ static void am65_cpsw_recv(struct eth_device *edev)
dma_addr_t pkt;
int ret;
u32 num, port_id;
- bool valid = true;
if (!common->started)
return;
@@ -489,18 +488,17 @@ static void am65_cpsw_recv(struct eth_device *edev)
port_id = packet_data.src_tag;
if (port_id >= AM65_CPSW_CPSWNU_MAX_PORTS) {
dev_err(common->dev, "received pkt on invalid port_id %d\n", port_id);
- valid = false;
+ goto out;
}
port = &common->ports[port_id];
if (!port->enabled) {
dev_err(common->dev, "received pkt on disabled port_id %d\n", port_id);
- valid = false;
+ goto out;
}
- if (valid)
- net_receive(&port->edev, (void *)pkt, ret);
-
+ net_receive(&port->edev, (void *)pkt, ret);
+out:
num = common->rx_next % UDMA_RX_DESC_NUM;
dma_sync_single_for_device(common->dev, pkt, ret, DMA_FROM_DEVICE);
--
2.39.5
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] net: am65-cpsw-nuss: fix out-of-bounds access
2025-03-17 11:31 [PATCH] net: am65-cpsw-nuss: fix out-of-bounds access Ahmad Fatoum
@ 2025-03-17 12:27 ` Sascha Hauer
0 siblings, 0 replies; 2+ messages in thread
From: Sascha Hauer @ 2025-03-17 12:27 UTC (permalink / raw)
To: barebox, Ahmad Fatoum
On Mon, 17 Mar 2025 12:31:42 +0100, Ahmad Fatoum wrote:
> GCC 12.2.0 complains about am65_cpsw_recv:
>
> drivers/net/am65-cpsw-nuss.c: In function ‘am65_cpsw_recv’:
> drivers/net/am65-cpsw-nuss.c:495:30: warning: array subscript 9 is
> above array bounds of ‘struct am65_cpsw_port[9]’ [-Warray-bounds]
> 495 | port = &common->ports[port_id];
> | ~~~~~~~~~~~~~^~~~~~~~~
> drivers/net/am65-cpsw-nuss.c:115:33: note: while referencing ‘ports’
> 115 | struct am65_cpsw_port ports[AM65_CPSW_CPSWNU_MAX_PORTS];
> | ^~~~~
>
> [...]
Applied, thanks!
[1/1] net: am65-cpsw-nuss: fix out-of-bounds access
https://git.pengutronix.de/cgit/barebox/commit/?id=9c9f95c45431 (link may not be stable)
Best regards,
--
Sascha Hauer <s.hauer@pengutronix.de>
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2025-03-17 12:27 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2025-03-17 11:31 [PATCH] net: am65-cpsw-nuss: fix out-of-bounds access Ahmad Fatoum
2025-03-17 12:27 ` Sascha Hauer
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox