* [PATCH iproute2] iplink_vrf: Save device index from response for return code
@ 2018-06-01 15:50 dsahern
2018-06-01 17:05 ` Phil Sutter
2018-06-04 1:11 ` Hangbin Liu
0 siblings, 2 replies; 3+ messages in thread
From: dsahern @ 2018-06-01 15:50 UTC (permalink / raw)
To: stephen, netdev; +Cc: David Ahern, Hangbin Liu, Phil Sutter
From: David Ahern <dsahern@gmail.com>
A recent commit changed rtnl_talk_* to return the response message in
allocated memory so callers need to free it. The change to name_is_vrf
did not save the device index which is pointing to a struct inside the
now allocated and freed memory resulting in garbage getting returned
in some cases.
Fix by using a stack variable to save the return value and only set
it to ifi->ifi_index after all checks are done and before the answer
buffer is freed.
Fixes: 86bf43c7c2fdc ("lib/libnetlink: update rtnl_talk to support malloc buff at run time")
Cc: Hangbin Liu <liuhangbin@gmail.com>
Cc: Phil Sutter <phil@nwl.cc>
Signed-off-by: David Ahern <dsahern@gmail.com>
---
ip/iplink_vrf.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/ip/iplink_vrf.c b/ip/iplink_vrf.c
index e9dd0df98412..6004bb4f305e 100644
--- a/ip/iplink_vrf.c
+++ b/ip/iplink_vrf.c
@@ -191,6 +191,7 @@ int name_is_vrf(const char *name)
struct rtattr *tb[IFLA_MAX+1];
struct rtattr *li[IFLA_INFO_MAX+1];
struct ifinfomsg *ifi;
+ int ifindex = 0;
int len;
addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, strlen(name) + 1);
@@ -218,7 +219,8 @@ int name_is_vrf(const char *name)
if (strcmp(RTA_DATA(li[IFLA_INFO_KIND]), "vrf"))
goto out;
+ ifindex = ifi->ifi_index;
out:
free(answer);
- return ifi->ifi_index;
+ return ifindex;
}
--
2.11.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH iproute2] iplink_vrf: Save device index from response for return code
2018-06-01 15:50 [PATCH iproute2] iplink_vrf: Save device index from response for return code dsahern
@ 2018-06-01 17:05 ` Phil Sutter
2018-06-04 1:11 ` Hangbin Liu
1 sibling, 0 replies; 3+ messages in thread
From: Phil Sutter @ 2018-06-01 17:05 UTC (permalink / raw)
To: dsahern; +Cc: stephen, netdev, David Ahern, Hangbin Liu
On Fri, Jun 01, 2018 at 08:50:16AM -0700, dsahern@kernel.org wrote:
> From: David Ahern <dsahern@gmail.com>
>
> A recent commit changed rtnl_talk_* to return the response message in
> allocated memory so callers need to free it. The change to name_is_vrf
> did not save the device index which is pointing to a struct inside the
> now allocated and freed memory resulting in garbage getting returned
> in some cases.
>
> Fix by using a stack variable to save the return value and only set
> it to ifi->ifi_index after all checks are done and before the answer
> buffer is freed.
>
> Fixes: 86bf43c7c2fdc ("lib/libnetlink: update rtnl_talk to support malloc buff at run time")
> Cc: Hangbin Liu <liuhangbin@gmail.com>
> Cc: Phil Sutter <phil@nwl.cc>
> Signed-off-by: David Ahern <dsahern@gmail.com>
Acked-by: Phil Sutter <phil@nwl.cc>
Thanks, Phil
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH iproute2] iplink_vrf: Save device index from response for return code
2018-06-01 15:50 [PATCH iproute2] iplink_vrf: Save device index from response for return code dsahern
2018-06-01 17:05 ` Phil Sutter
@ 2018-06-04 1:11 ` Hangbin Liu
1 sibling, 0 replies; 3+ messages in thread
From: Hangbin Liu @ 2018-06-04 1:11 UTC (permalink / raw)
To: dsahern; +Cc: stephen, netdev, David Ahern, Phil Sutter
On Fri, Jun 01, 2018 at 08:50:16AM -0700, dsahern@kernel.org wrote:
> From: David Ahern <dsahern@gmail.com>
>
> A recent commit changed rtnl_talk_* to return the response message in
> allocated memory so callers need to free it. The change to name_is_vrf
> did not save the device index which is pointing to a struct inside the
> now allocated and freed memory resulting in garbage getting returned
> in some cases.
>
> Fix by using a stack variable to save the return value and only set
> it to ifi->ifi_index after all checks are done and before the answer
> buffer is freed.
>
> Fixes: 86bf43c7c2fdc ("lib/libnetlink: update rtnl_talk to support malloc buff at run time")
> Cc: Hangbin Liu <liuhangbin@gmail.com>
> Cc: Phil Sutter <phil@nwl.cc>
> Signed-off-by: David Ahern <dsahern@gmail.com>
> ---
> ip/iplink_vrf.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/ip/iplink_vrf.c b/ip/iplink_vrf.c
> index e9dd0df98412..6004bb4f305e 100644
> --- a/ip/iplink_vrf.c
> +++ b/ip/iplink_vrf.c
> @@ -191,6 +191,7 @@ int name_is_vrf(const char *name)
> struct rtattr *tb[IFLA_MAX+1];
> struct rtattr *li[IFLA_INFO_MAX+1];
> struct ifinfomsg *ifi;
> + int ifindex = 0;
> int len;
>
> addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, strlen(name) + 1);
> @@ -218,7 +219,8 @@ int name_is_vrf(const char *name)
> if (strcmp(RTA_DATA(li[IFLA_INFO_KIND]), "vrf"))
> goto out;
>
> + ifindex = ifi->ifi_index;
> out:
> free(answer);
> - return ifi->ifi_index;
> + return ifindex;
> }
> --
> 2.11.0
>
Thanks for the fix.
Acked-by: Hangbin Liu <liuhangbin@gmail.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
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2018-06-01 15:50 [PATCH iproute2] iplink_vrf: Save device index from response for return code dsahern
2018-06-01 17:05 ` Phil Sutter
2018-06-04 1:11 ` Hangbin Liu
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