From nobody Fri Sep 25 04:09:09 2026 Received: from cstnet.cn (smtp25.cstnet.cn [159.226.251.25]) (using TLSv1.2 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 43FD13DCD86; Wed, 16 Sep 2026 17:58:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.226.251.25 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789581512; cv=none; b=BZQnxZ3WbtJ6JFT+gb22kQwzcWXpPSOXwLpozxgONgT6MFYqOhg1tuXI6Wl7kC9hgLoodpuhh2tdzQl/UKoRU0kkTCqHh4qR1dXDtlyc4nVzrQzIs4u5qt5PyiqPUY967Iv5Xtlxu2dR8d6hCfYnmzQRnQcFRLkhzdZzwSiQpPM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789581512; c=relaxed/simple; bh=TuVQ/Es5hLJUu2208ktlLHlo/7EaUpg4zBiZGim74Ek=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=mSO5mgD1aTVJm/h4GxBdN2xKPFWwN1beczj4a9zGkLT6YGiToobu8joLAxQ0FUVnKCatxmEfrpPEuBcFOoUml48XdqtMbiCRNx6saxwuRwo3FGvobU5CCFDE1NKiCyr7NexPQGaRLqtbvqpYvDrw1eLNNHRCxp0koPKtjUn/6jw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn; spf=pass smtp.mailfrom=iscas.ac.cn; arc=none smtp.client-ip=159.226.251.25 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=iscas.ac.cn Received: from dfae2b116770.home.arpa (unknown [36.110.52.2]) by APP-05 (Coremail) with SMTP id zQCowAAHcz2u2KpqJwtvCA--.23607S2; Thu, 17 Sep 2026 01:58:06 +0800 (CST) From: Wentao Liang To: abhinav.kumar@linux.dev Cc: airlied@gmail.com, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, jesszhan0024@gmail.com, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, lumag@kernel.org, marijn.suijten@somainline.org, robin.clark@oss.qualcomm.com, sean@poorly.run, simona@ffwll.ch, Wentao Liang , stable@vger.kernel.org Subject: [PATCH] drm/msm/dsi: Fix VM leak in dsi_tx_buf_alloc_6g() Date: Wed, 16 Sep 2026 17:57:38 +0000 Message-Id: <20260916175738.2089950-1-vulab@iscas.ac.cn> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: zQCowAAHcz2u2KpqJwtvCA--.23607S2 X-Coremail-Antispam: 1UD129KBjvdXoWrZry7Wr4UuFyruFWDGFWrAFb_yoWkZFbEga sYqwn7JF47KFnrKF1jyw12vrWqkFya9r40vr1rt3W3JFyqyr15W34SvFs5Z3ZF9r4rJF9F yw17Xr1rXrsFgjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUIcSsGvfJTRUUUb-xFF20E14v26r4j6ryUM7CY07I20VC2zVCF04k26cxKx2IYs7xG 6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8w A2z4x0Y4vE2Ix0cI8IcVAFwI0_Xr0_Ar1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr1j 6F4UJwA2z4x0Y4vEx4A2jsIE14v26r4UJVWxJr1l84ACjcxK6I8E87Iv6xkF7I0E14v26F 4UJVW0owAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv 7VC0I7IYx2IY67AKxVWUtVWrXwAv7VC2z280aVAFwI0_Cr0_Gr1UMcvjeVCFs4IE7xkEbV WUJVW8JwACjcxG0xvY0x0EwIxGrwACjI8F5VA0II8E6IAqYI8I648v4I1lFIxGxcIEc7Cj xVA2Y2ka0xkIwI1lc7CjxVAaw2AFwI0_Jw0_GFyl42xK82IYc2Ij64vIr41l4I8I3I0E4I kC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWU WwC2zVAF1VAY17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_JF I_Gr1lIxAIcVC0I7IYx2IY6xkF7I0E14v26r4UJVWxJr1lIxAIcVCF04k26cxKx2IYs7xG 6r1j6r1xMIIF0xvEx4A2jsIE14v26F4j6r4UJwCI42IY6I8E87Iv6xkF7I0E14v26F4UJV W0obIYCTnIWIevJa73UjIFyTuYvjfUFhL0UUUUU X-CM-SenderInfo: pyxotu46lvutnvoduhdfq/1tbiBwcMA2qqpVhvogAAs- Content-Type: text/plain; charset="utf-8" dsi_tx_buf_alloc_6g() takes a reference to the kms VM with drm_gpuvm_get() and stores it in msm_host->vm. If msm_gem_kernel_new() fails, the function returns early without dropping that reference. Since msm_host->tx_gem_obj is cleared on the error path, msm_dsi_tx_buf_free() will never see a non-NULL tx_gem_obj and thus never calls drm_gpuvm_put(), leaking the VM reference. Drop the VM reference and clear msm_host->vm on the error path. Fixes: 5e05be782645 ("drm/msm/dsi: free TX buffer in unbind") Cc: stable@vger.kernel.org Signed-off-by: Wentao Liang --- drivers/gpu/drm/msm/dsi/dsi_host.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/d= si_host.c index 982abaaac00d..29e0de0e0c22 100644 --- a/drivers/gpu/drm/msm/dsi/dsi_host.c +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c @@ -1250,6 +1250,8 @@ int dsi_tx_buf_alloc_6g(struct msm_dsi_host *msm_host= , int size) =20 if (IS_ERR(data)) { msm_host->tx_gem_obj =3D NULL; + drm_gpuvm_put(msm_host->vm); + msm_host->vm =3D NULL; return PTR_ERR(data); } =20 --=20 2.34.1