diff options
| author | Florian Westphal <fw@strlen.de> | 2020-12-22 23:23:56 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-01-12 20:16:24 +0100 |
| commit | 5e401ea71676bd7c82ce44eb663fec7678ccffdd (patch) | |
| tree | 8502275e49f84a1dc5790c4d3fdf7a04b4c09dde | |
| parent | 1dd6a790c22063caf3b2b4eb8376ce0625cbc8cd (diff) | |
netfilter: xt_RATEEST: reject non-null terminated string from userspace
commit 6cb56218ad9e580e519dcd23bfb3db08d8692e5a upstream.
syzbot reports:
detected buffer overflow in strlen
[..]
Call Trace:
strlen include/linux/string.h:325 [inline]
strlcpy include/linux/string.h:348 [inline]
xt_rateest_tg_checkentry+0x2a5/0x6b0 net/netfilter/xt_RATEEST.c:143
strlcpy assumes src is a c-string. Check info->name before its used.
Reported-by: syzbot+e86f7c428c8c50db65b4@syzkaller.appspotmail.com
Fixes: 5859034d7eb8793 ("[NETFILTER]: x_tables: add RATEEST target")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/netfilter/xt_RATEEST.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/netfilter/xt_RATEEST.c b/net/netfilter/xt_RATEEST.c index 2236455b10a3..182c1285b4ad 100644 --- a/net/netfilter/xt_RATEEST.c +++ b/net/netfilter/xt_RATEEST.c @@ -115,6 +115,9 @@ static int xt_rateest_tg_checkentry(const struct xt_tgchk_param *par) } cfg; int ret; + if (strnlen(info->name, sizeof(est->name)) >= sizeof(est->name)) + return -ENAMETOOLONG; + net_get_random_once(&jhash_rnd, sizeof(jhash_rnd)); mutex_lock(&xn->hash_lock); |