From: WANG Cong Date: Thu, 3 Nov 2016 16:42:36 +0000 (-0700) Subject: taskstats: fix the length of cgroupstats_cmd_get_policy X-Git-Tag: v4.13~1906^2~44 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=243d52126184b072a18fe2130ce0008f8aa3a340;p=mirror_ubuntu-bionic-kernel.git taskstats: fix the length of cgroupstats_cmd_get_policy cgroupstats_cmd_get_policy is [CGROUPSTATS_CMD_ATTR_MAX+1], taskstats_cmd_get_policy[TASKSTATS_CMD_ATTR_MAX+1], but their family.maxattr is TASKSTATS_CMD_ATTR_MAX. CGROUPSTATS_CMD_ATTR_MAX is less than TASKSTATS_CMD_ATTR_MAX, so we could end up accessing out-of-bound. Change cgroupstats_cmd_get_policy to TASKSTATS_CMD_ATTR_MAX+1, this is safe because the rest are initialized to 0's. Reported-by: Andrey Konovalov Tested-by: Andrey Konovalov Signed-off-by: Cong Wang Signed-off-by: David S. Miller --- diff --git a/kernel/taskstats.c b/kernel/taskstats.c index b3f05ee20d18..cbb387a265db 100644 --- a/kernel/taskstats.c +++ b/kernel/taskstats.c @@ -54,7 +54,11 @@ static const struct nla_policy taskstats_cmd_get_policy[TASKSTATS_CMD_ATTR_MAX+1 [TASKSTATS_CMD_ATTR_REGISTER_CPUMASK] = { .type = NLA_STRING }, [TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK] = { .type = NLA_STRING },}; -static const struct nla_policy cgroupstats_cmd_get_policy[CGROUPSTATS_CMD_ATTR_MAX+1] = { +/* + * We have to use TASKSTATS_CMD_ATTR_MAX here, it is the maxattr in the family. + * Make sure they are always aligned. + */ +static const struct nla_policy cgroupstats_cmd_get_policy[TASKSTATS_CMD_ATTR_MAX+1] = { [CGROUPSTATS_CMD_ATTR_FD] = { .type = NLA_U32 }, };