diff mbox

[net-next,v2] taskstats: fix nl parsing in accounting/getdelays.c

Message ID 1461772388-3763-1-git-send-email-nicolas.dichtel@6wind.com
State Awaiting Upstream
Delegated to: Pablo Neira
Headers show

Commit Message

Nicolas Dichtel April 27, 2016, 3:53 p.m. UTC
The type TASKSTATS_TYPE_NULL should always be ignored.

When jumping to the next attribute, only the length of the current
attribute should be added, not the length of all nested attributes.
This last bug was not visible before commit 80df554275c2, because the
kernel didn't put more than two nested attributes.

Fixes: a3baf649ca9c ("[PATCH] per-task-delay-accounting: documentation")
Fixes: 80df554275c2 ("taskstats: use the libnl API to align nlattr on 64-bit")
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
---
 Documentation/accounting/getdelays.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Comments

David Miller April 27, 2016, 4:56 p.m. UTC | #1
From: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Date: Wed, 27 Apr 2016 17:53:08 +0200

> The type TASKSTATS_TYPE_NULL should always be ignored.
> 
> When jumping to the next attribute, only the length of the current
> attribute should be added, not the length of all nested attributes.
> This last bug was not visible before commit 80df554275c2, because the
> kernel didn't put more than two nested attributes.
> 
> Fixes: a3baf649ca9c ("[PATCH] per-task-delay-accounting: documentation")
> Fixes: 80df554275c2 ("taskstats: use the libnl API to align nlattr on 64-bit")
> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>

Applied, thanks.
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diff mbox

Patch

diff --git a/Documentation/accounting/getdelays.c b/Documentation/accounting/getdelays.c
index 7785fb5eb93f..b5ca536e56a8 100644
--- a/Documentation/accounting/getdelays.c
+++ b/Documentation/accounting/getdelays.c
@@ -505,6 +505,8 @@  int main(int argc, char *argv[])
 						if (!loop)
 							goto done;
 						break;
+					case TASKSTATS_TYPE_NULL:
+						break;
 					default:
 						fprintf(stderr, "Unknown nested"
 							" nla_type %d\n",
@@ -512,7 +514,8 @@  int main(int argc, char *argv[])
 						break;
 					}
 					len2 += NLA_ALIGN(na->nla_len);
-					na = (struct nlattr *) ((char *) na + len2);
+					na = (struct nlattr *)((char *)na +
+							       NLA_ALIGN(na->nla_len));
 				}
 				break;