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From:   Zheyu Ma <zheyuma97@gmail.com>
Date:   Sun, 17 Jul 2022 11:47:56 +0800
Message-ID: <CAMhUBjn=k-4DV0-u_30_rNQc9n__ZkwVFaLwfP1CP-uk1LjMpg@mail.gmail.com>
Subject: [BUG] most: usb: Found a bug at the probe time
To:     sumit.semwal@linaro.org, christian.koenig@amd.com
Cc:     Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-media <linux-media@vger.kernel.org>,
        DRI Development <dri-devel@lists.freedesktop.org>,
        linaro-mm-sig@lists.linaro.org
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Hello,

I found a bug in the most usb driver.

When the driver fails at

    mdev->conf = kcalloc(num_endpoints, sizeof(*mdev->conf), GFP_KERNEL);

I got the following warning message:


[   15.406256] kobject: '(null)' (ffff8881068f8000): is not
initialized, yet kobject_put() is being called.
[   15.406986] WARNING: CPU: 3 PID: 396 at lib/kobject.c:720
kobject_put+0x6e/0x1c0
[   15.410120] RIP: 0010:kobject_put+0x6e/0x1c0
[   15.410470] Code: 01 75 29 4c 89 f8 48 c1 e8 03 80 3c 28 00 74 08
4c 89 ff e8 14 2e 73 ff 49 8b 37 48 c7 c7 c0 fc de 85 4c 89 fa e8 e2
61 21 ff <0f> 0b 49 8d 5f 38 48 89 df be 04 00 00 00 e8 df 2e 73 ff b8
ff ff
[   15.416529] Call Trace:
[   15.416896]  hdm_probe+0xf3d/0x1090 [most_usb]

Since I'm not familiar with the driver, I ask for your help to solve
the warning.

regards,

Zheyu Ma