* [PATCH] raw/ioat: Check for the NULL pointer after calling malloc
@ 2022-06-27 17:52 835703180
2022-07-05 10:14 ` Bruce Richardson
2022-07-05 19:43 ` Thomas Monjalon
0 siblings, 2 replies; 4+ messages in thread
From: 835703180 @ 2022-06-27 17:52 UTC (permalink / raw)
To: bruce.richardson; +Cc: dev, Shiqi Liu
From: Shiqi Liu <835703180@qq.com>
As the possible failure of the malloc(), the not_checked and
checked could be NULL pointer.
Therefore, it should be better to check it in order to avoid
the dereference of the NULL pointer.
Fixes: b7aaf417f93 ("raw/ioat: add bus driver for device scanning automatically")
Signed-off-by: Shiqi Liu <835703180@qq.com>
---
drivers/raw/ioat/idxd_bus.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/raw/ioat/idxd_bus.c b/drivers/raw/ioat/idxd_bus.c
index 539f51b1b1..8ab4ed5885 100644
--- a/drivers/raw/ioat/idxd_bus.c
+++ b/drivers/raw/ioat/idxd_bus.c
@@ -301,6 +301,10 @@ dsa_scan(void)
IOAT_PMD_DEBUG("%s(): found %s/%s", __func__, path, wq->d_name);
dev = malloc(sizeof(*dev));
+ if (dev == NULL) {
+ closedir(dev_dir);
+ return ENOMEM;
+ }
if (dsa_addr_parse(wq->d_name, &dev->addr) < 0) {
IOAT_PMD_ERR("Error parsing WQ name: %s", wq->d_name);
free(dev);
--
2.35.1.windows.2
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] raw/ioat: Check for the NULL pointer after calling malloc
2022-06-27 17:52 [PATCH] raw/ioat: Check for the NULL pointer after calling malloc 835703180
@ 2022-07-05 10:14 ` Bruce Richardson
2022-07-05 19:43 ` Thomas Monjalon
1 sibling, 0 replies; 4+ messages in thread
From: Bruce Richardson @ 2022-07-05 10:14 UTC (permalink / raw)
To: 835703180; +Cc: dev
On Tue, Jun 28, 2022 at 01:52:26AM +0800, 835703180@qq.com wrote:
> From: Shiqi Liu <835703180@qq.com>
>
> As the possible failure of the malloc(), the not_checked and
> checked could be NULL pointer.
> Therefore, it should be better to check it in order to avoid
> the dereference of the NULL pointer.
>
> Fixes: b7aaf417f93 ("raw/ioat: add bus driver for device scanning automatically")
>
> Signed-off-by: Shiqi Liu <835703180@qq.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] raw/ioat: Check for the NULL pointer after calling malloc
2022-06-27 17:52 [PATCH] raw/ioat: Check for the NULL pointer after calling malloc 835703180
2022-07-05 10:14 ` Bruce Richardson
@ 2022-07-05 19:43 ` Thomas Monjalon
2022-07-06 9:05 ` Bruce Richardson
1 sibling, 1 reply; 4+ messages in thread
From: Thomas Monjalon @ 2022-07-05 19:43 UTC (permalink / raw)
To: Shiqi Liu; +Cc: bruce.richardson, dev
27/06/2022 19:52, 835703180@qq.com:
> From: Shiqi Liu <835703180@qq.com>
>
> As the possible failure of the malloc(), the not_checked and
> checked could be NULL pointer.
> Therefore, it should be better to check it in order to avoid
> the dereference of the NULL pointer.
>
> Fixes: b7aaf417f93 ("raw/ioat: add bus driver for device scanning automatically")
>
> Signed-off-by: Shiqi Liu <835703180@qq.com>
> ---
> --- a/drivers/raw/ioat/idxd_bus.c
> +++ b/drivers/raw/ioat/idxd_bus.c
> @@ -301,6 +301,10 @@ dsa_scan(void)
> IOAT_PMD_DEBUG("%s(): found %s/%s", __func__, path, wq->d_name);
>
> dev = malloc(sizeof(*dev));
> + if (dev == NULL) {
> + closedir(dev_dir);
> + return ENOMEM;
Isn't it supposed to be a negative value?
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] raw/ioat: Check for the NULL pointer after calling malloc
2022-07-05 19:43 ` Thomas Monjalon
@ 2022-07-06 9:05 ` Bruce Richardson
0 siblings, 0 replies; 4+ messages in thread
From: Bruce Richardson @ 2022-07-06 9:05 UTC (permalink / raw)
To: Thomas Monjalon; +Cc: Shiqi Liu, dev
On Tue, Jul 05, 2022 at 09:43:34PM +0200, Thomas Monjalon wrote:
> 27/06/2022 19:52, 835703180@qq.com:
> > From: Shiqi Liu <835703180@qq.com>
> >
> > As the possible failure of the malloc(), the not_checked and
> > checked could be NULL pointer.
> > Therefore, it should be better to check it in order to avoid
> > the dereference of the NULL pointer.
> >
> > Fixes: b7aaf417f93 ("raw/ioat: add bus driver for device scanning automatically")
> >
> > Signed-off-by: Shiqi Liu <835703180@qq.com>
> > ---
> > --- a/drivers/raw/ioat/idxd_bus.c
> > +++ b/drivers/raw/ioat/idxd_bus.c
> > @@ -301,6 +301,10 @@ dsa_scan(void)
> > IOAT_PMD_DEBUG("%s(): found %s/%s", __func__, path, wq->d_name);
> >
> > dev = malloc(sizeof(*dev));
> > + if (dev == NULL) {
> > + closedir(dev_dir);
> > + return ENOMEM;
>
> Isn't it supposed to be a negative value?
>
Yes, I missed that on my review. Reading the definition of what the bus
"scan" method is to return it indicates <0 on error.
/Bruce
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2022-07-06 9:05 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2022-06-27 17:52 [PATCH] raw/ioat: Check for the NULL pointer after calling malloc 835703180
2022-07-05 10:14 ` Bruce Richardson
2022-07-05 19:43 ` Thomas Monjalon
2022-07-06 9:05 ` Bruce Richardson
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