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ethtool: fix string set id check

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Syzbot reported a shift of a u32 by more than 31 in strset_parse_request()
which is undefined behavior. This is caused by range check of string set id
using variable ret (which is always 0 at this point) instead of id (string
set id from request).

Fixes: 71921690f9 ("ethtool: provide string sets with STRSET_GET request")
Reported-by: syzbot+96523fb438937cd01220@syzkaller.appspotmail.com
Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Link: https://lore.kernel.org/r/b54ed5c5fd972a59afea3e1badfb36d86df68799.1607952208.git.mkubecek@suse.cz
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Michal Kubecek
2020-12-14 14:25:01 +01:00
committed by Jakub Kicinski
parent f87675b836
commit efb796f557
1 changed files with 1 additions and 1 deletions
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2
net/ethtool/strset.c
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@@ -182,7 +182,7 @@ static int strset_parse_request(struct ethnl_req_info *req_base,
ret = strset_get_id(attr, &id, extack); ret = strset_get_id(attr, &id, extack);
if (ret < 0) if (ret < 0)
return ret; return ret;
if (ret >= ETH_SS_COUNT) { if (id >= ETH_SS_COUNT) {
NL_SET_ERR_MSG_ATTR(extack, attr, NL_SET_ERR_MSG_ATTR(extack, attr,
"unknown string set id"); "unknown string set id");
return -EOPNOTSUPP; return -EOPNOTSUPP;