From: Carlos López clopez@suse.de

stable inclusion from stable-v6.6.33 commit ad4b202da2c498fefb69e5d87f67b946e7fe1e6a bugzilla: https://gitee.com/src-openeuler/kernel/issues/IA7DBJ CVE: CVE-2024-36481

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ Upstream commit e569eb34970281438e2b48a3ef11c87459fcfbcb ]

btf_find_struct_member() might return NULL or an error via the ERR_PTR() macro. However, its caller in parse_btf_field() only checks for the NULL condition. Fix this by using IS_ERR() and returning the error up the stack.

Link: https://lore.kernel.org/all/20240527094351.15687-1-clopez@suse.de/

Fixes: c440adfbe3025 ("tracing/probes: Support BTF based data structure field access") Signed-off-by: Carlos López clopez@suse.de Signed-off-by: Masami Hiramatsu (Google) mhiramat@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Zheng Yejian zhengyejian1@huawei.com --- kernel/trace/trace_probe.c | 4 ++++ 1 file changed, 4 insertions(+)

diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c index 34289f9c6707..ae162ba36a48 100644 --- a/kernel/trace/trace_probe.c +++ b/kernel/trace/trace_probe.c @@ -553,6 +553,10 @@ static int parse_btf_field(char *fieldname, const struct btf_type *type, anon_offs = 0; field = btf_find_struct_member(ctx->btf, type, fieldname, &anon_offs); + if (IS_ERR(field)) { + trace_probe_log_err(ctx->offset, BAD_BTF_TID); + return PTR_ERR(field); + } if (!field) { trace_probe_log_err(ctx->offset, NO_BTF_FIELD); return -ENOENT;