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authorJakub Kicinski <kuba@kernel.org>2021-01-12 17:21:21 +0100
committerJakub Kicinski <kuba@kernel.org>2021-01-12 20:22:01 -0800
commit25fe2c9c4cd2e97c5f5b69f3aefe69aad3057936 (patch)
tree09e27f006401b300b01ef8d4bcb890bbf6bbcdaf /net
parent584c19f92754e9d590d75a94df66c47f7c4fd2cc (diff)
smc: fix out of bound access in smc_nl_get_sys_info()
smc_clc_get_hostname() sets the host pointer to a buffer which is not NULL-terminated (see smc_clc_init()). Reported-by: syzbot+f4708c391121cfc58396@syzkaller.appspotmail.com Fixes: 099b990bd11a ("net/smc: Add support for obtaining system information") Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net')
-rw-r--r--net/smc/smc_core.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index 59342b519e34..8d866b4ed8f6 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -246,7 +246,8 @@ int smc_nl_get_sys_info(struct sk_buff *skb, struct netlink_callback *cb)
goto errattr;
smc_clc_get_hostname(&host);
if (host) {
- snprintf(hostname, sizeof(hostname), "%s", host);
+ memcpy(hostname, host, SMC_MAX_HOSTNAME_LEN);
+ hostname[SMC_MAX_HOSTNAME_LEN] = 0;
if (nla_put_string(skb, SMC_NLA_SYS_LOCAL_HOST, hostname))
goto errattr;
}