6.6-stable review patch. If anyone has any objections, please let me know.
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From: Anton Protopopov a.s.protopopov@gmail.com
[ Upstream commit fd5fd538a1f4b34cee6823ba0ddda2f7a55aca96 ]
Return value of the validate_nla() function can be propagated all the way up to users of libbpf API. In case of error this libbpf version of validate_nla returns -1 which will be seen as -EPERM from user's point of view. Instead, return a more reasonable -EINVAL.
Fixes: bbf48c18ee0c ("libbpf: add error reporting in XDP") Suggested-by: Andrii Nakryiko andrii@kernel.org Signed-off-by: Anton Protopopov a.s.protopopov@gmail.com Signed-off-by: Andrii Nakryiko andrii@kernel.org Link: https://lore.kernel.org/bpf/20250510182011.2246631-1-a.s.protopopov@gmail.co... Signed-off-by: Sasha Levin sashal@kernel.org --- tools/lib/bpf/nlattr.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-)
diff --git a/tools/lib/bpf/nlattr.c b/tools/lib/bpf/nlattr.c index 975e265eab3bf..06663f9ea581f 100644 --- a/tools/lib/bpf/nlattr.c +++ b/tools/lib/bpf/nlattr.c @@ -63,16 +63,16 @@ static int validate_nla(struct nlattr *nla, int maxtype, minlen = nla_attr_minlen[pt->type];
if (libbpf_nla_len(nla) < minlen) - return -1; + return -EINVAL;
if (pt->maxlen && libbpf_nla_len(nla) > pt->maxlen) - return -1; + return -EINVAL;
if (pt->type == LIBBPF_NLA_STRING) { char *data = libbpf_nla_data(nla);
if (data[libbpf_nla_len(nla) - 1] != '\0') - return -1; + return -EINVAL; }
return 0; @@ -118,19 +118,18 @@ int libbpf_nla_parse(struct nlattr *tb[], int maxtype, struct nlattr *head, if (policy) { err = validate_nla(nla, maxtype, policy); if (err < 0) - goto errout; + return err; }
- if (tb[type]) + if (tb[type]) { pr_warn("Attribute of type %#x found multiple times in message, " "previous attribute is being ignored.\n", type); + }
tb[type] = nla; }
- err = 0; -errout: - return err; + return 0; }
/**