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tracing/probes: Fix to search structure fields correctly

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commit 9704669c386f9bbfef2e002e7e690c56b7dcf5de upstream.

Fix to search a field from the structure which has anonymous union
correctly.
Since the reference `type` pointer was updated in the loop, the search
loop suddenly aborted where it hits an anonymous union. Thus it can not
find the field after the anonymous union. This avoids updating the
cursor `type` pointer in the loop.

Link: https://lore.kernel.org/all/170791694361.389532.10047514554799419688.stgit@devnote2/

Fixes: 302db0f5b3d8 ("tracing/probes: Add a function to search a member of a struct/union")
Cc: stable@vger.kernel.org
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Masami Hiramatsu (Google) 2024-02-17 21:25:42 +09:00 committed by Greg Kroah-Hartman
parent ebc1972c2c
commit d767929311
1 changed files with 2 additions and 2 deletions
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4
kernel/trace/trace_btf.c
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@ -91,8 +91,8 @@ retry:
for_each_member(i, type, member) {
if (!member->name_off) {
/* Anonymous union/struct: push it for later use */
type = btf_type_skip_modifiers(btf, member->type, &tid);
if (type && top < BTF_ANON_STACK_MAX) {
if (btf_type_skip_modifiers(btf, member->type, &tid) &&
top < BTF_ANON_STACK_MAX) {
anon_stack[top].tid = tid;
anon_stack[top++].offset =
cur_offset + member->offset;