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| author | David Ahern <dsahern@kernel.org> | 2020-04-01 21:02:25 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-04-02 09:35:25 -0700 |
| commit | 4054ab64e29bb05b3dfe758fff3c38a74ba753bb (patch) | |
| tree | 37e34f597bc00fe5fb179f6d50bc9185d0d4bfcc /tools/accounting | |
| parent | 1a323ea5356edbb3073dc59d51b9e6b86908857d (diff) | |
| download | lwn-4054ab64e29bb05b3dfe758fff3c38a74ba753bb.tar.gz lwn-4054ab64e29bb05b3dfe758fff3c38a74ba753bb.zip | |
tools/accounting/getdelays.c: fix netlink attribute length
A recent change to the netlink code: 6e237d099fac ("netlink: Relax attr
validation for fixed length types") logs a warning when programs send
messages with invalid attributes (e.g., wrong length for a u32). Yafang
reported this error message for tools/accounting/getdelays.c.
send_cmd() is wrongly adding 1 to the attribute length. As noted in
include/uapi/linux/netlink.h nla_len should be NLA_HDRLEN + payload
length, so drop the +1.
Fixes: 9e06d3f9f6b1 ("per task delay accounting taskstats interface: documentation fix")
Reported-by: Yafang Shao <laoar.shao@gmail.com>
Signed-off-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: Yafang Shao <laoar.shao@gmail.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Shailabh Nagar <nagar@watson.ibm.com>
Cc: <stable@vger.kernel.org>
Link: http://lkml.kernel.org/r/20200327173111.63922-1-dsahern@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'tools/accounting')
| -rw-r--r-- | tools/accounting/getdelays.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/accounting/getdelays.c b/tools/accounting/getdelays.c index 8cb504d30384..5ef1c15e88ad 100644 --- a/tools/accounting/getdelays.c +++ b/tools/accounting/getdelays.c @@ -136,7 +136,7 @@ static int send_cmd(int sd, __u16 nlmsg_type, __u32 nlmsg_pid, msg.g.version = 0x1; na = (struct nlattr *) GENLMSG_DATA(&msg); na->nla_type = nla_type; - na->nla_len = nla_len + 1 + NLA_HDRLEN; + na->nla_len = nla_len + NLA_HDRLEN; memcpy(NLA_DATA(na), nla_data, nla_len); msg.n.nlmsg_len += NLMSG_ALIGN(na->nla_len); |