linux-kernel - [PATCH 2/3] HID: bpf: fix return value of entrypoints_*_

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Message-Id: <20240419-hid_bpf_lazy_skel-v1-2-9210bcd4b61c@kernel.org>
Date: Fri, 19 Apr 2024 16:47:52 +0200
From: Benjamin Tissoires <bentiss@...nel.org>
To: Jiri Kosina <jikos@...nel.org>, 
 Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Benjamin Tissoires <bentiss@...nel.org>, stable@...r.kernel.org
Subject: [PATCH 2/3] HID: bpf: fix return value of entrypoints_*__attach()

Turns out that this function returns the attached fd, so a positive
or null value.
Given that we were having no other fds before, we were receiving 0,
and the test passed.

Cc: stable@...r.kernel.org
Fixes: f5c27da4e3c8 ("HID: initial BPF implementation")
Signed-off-by: Benjamin Tissoires <bentiss@...nel.org>
---
 drivers/hid/bpf/hid_bpf_jmp_table.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hid/bpf/hid_bpf_jmp_table.c b/drivers/hid/bpf/hid_bpf_jmp_table.c
index 89496aabbe15..301ac79db241 100644
--- a/drivers/hid/bpf/hid_bpf_jmp_table.c
+++ b/drivers/hid/bpf/hid_bpf_jmp_table.c
@@ -521,7 +521,7 @@ void hid_bpf_free_links_and_skel(void)
 
 #define ATTACH_AND_STORE_LINK(__name) do {					\
 	err = entrypoints_bpf__##__name##__attach(skel);			\
-	if (err)								\
+	if (err < 0)								\
 		goto out;							\
 										\
 	links[idx] = bpf_link_get_from_fd(skel->links.__name##_fd);		\

-- 
2.44.0