* [PATCH] net: 8390: fix potential NULL pointer dereferences
@ 2019-03-10 8:14 Kangjie Lu
2019-03-10 18:01 ` David Miller
0 siblings, 1 reply; 2+ messages in thread
From: Kangjie Lu @ 2019-03-10 8:14 UTC (permalink / raw)
To: kjlu; +Cc: pakki001, David S. Miller, netdev, linux-kernel
In case ioremap fails, the fix returns to avoid NULL pointer
dereferences.
Signed-off-by: Kangjie Lu <kjlu@umn.edu>
---
drivers/net/ethernet/8390/pcnet_cs.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/net/ethernet/8390/pcnet_cs.c b/drivers/net/ethernet/8390/pcnet_cs.c
index 61e43802b9a5..d82ecedf7366 100644
--- a/drivers/net/ethernet/8390/pcnet_cs.c
+++ b/drivers/net/ethernet/8390/pcnet_cs.c
@@ -289,6 +289,9 @@ static struct hw_info *get_hwinfo(struct pcmcia_device *link)
virt = ioremap(link->resource[2]->start,
resource_size(link->resource[2]));
+ if (unlikely(!virt))
+ return NULL;
+
for (i = 0; i < NR_INFO; i++) {
pcmcia_map_mem_page(link, link->resource[2],
hw_info[i].offset & ~(resource_size(link->resource[2])-1));
@@ -1423,6 +1426,11 @@ static int setup_shmem_window(struct pcmcia_device *link, int start_pg,
/* Try scribbling on the buffer */
info->base = ioremap(link->resource[3]->start,
resource_size(link->resource[3]));
+ if (unlikely(!info->base)) {
+ ret = -ENOMEM;
+ goto failed;
+ }
+
for (i = 0; i < (TX_PAGES<<8); i += 2)
__raw_writew((i>>1), info->base+offset+i);
udelay(100);
--
2.17.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] net: 8390: fix potential NULL pointer dereferences
2019-03-10 8:14 [PATCH] net: 8390: fix potential NULL pointer dereferences Kangjie Lu
@ 2019-03-10 18:01 ` David Miller
0 siblings, 0 replies; 2+ messages in thread
From: David Miller @ 2019-03-10 18:01 UTC (permalink / raw)
To: kjlu; +Cc: pakki001, netdev, linux-kernel
From: Kangjie Lu <kjlu@umn.edu>
Date: Sun, 10 Mar 2019 03:14:53 -0500
> In case ioremap fails, the fix returns to avoid NULL pointer
> dereferences.
>
> Signed-off-by: Kangjie Lu <kjlu@umn.edu>
> ---
> drivers/net/ethernet/8390/pcnet_cs.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/net/ethernet/8390/pcnet_cs.c b/drivers/net/ethernet/8390/pcnet_cs.c
> index 61e43802b9a5..d82ecedf7366 100644
> --- a/drivers/net/ethernet/8390/pcnet_cs.c
> +++ b/drivers/net/ethernet/8390/pcnet_cs.c
> @@ -289,6 +289,9 @@ static struct hw_info *get_hwinfo(struct pcmcia_device *link)
>
> virt = ioremap(link->resource[2]->start,
> resource_size(link->resource[2]));
> + if (unlikely(!virt))
> + return NULL;
Please retain the existing indentation, otherwise your changes are
impossible to read.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2019-03-10 18:01 ` David Miller
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