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libbpf: Fix alen calculation in libbpf_nla_dump_errormsg()

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[ Upstream commit 17bcd27a08 ]

The code assumes that everything that comes after nlmsgerr are nlattrs.
When calculating their size, it does not account for the initial
nlmsghdr. This may lead to accessing uninitialized memory.

Fixes: bbf48c18ee ("libbpf: add error reporting in XDP")
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20230210001210.395194-8-iii@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ilya Leoshkevich 2023-02-10 01:12:01 +01:00 committed by Greg Kroah-Hartman
parent a6a7d1541f
commit d5bdae351a
1 changed files with 1 additions and 1 deletions
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2
tools/lib/bpf/nlattr.c
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@ -170,7 +170,7 @@ int nla_dump_errormsg(struct nlmsghdr *nlh)
hlen += nlmsg_len(&err->msg);
attr = (struct nlattr *) ((void *) err + hlen);
alen = nlh->nlmsg_len - hlen;
alen = (void *)nlh + nlh->nlmsg_len - (void *)attr;
if (nla_parse(tb, NLMSGERR_ATTR_MAX, attr, alen, extack_policy) != 0) {
fprintf(stderr,