From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794064308; b=vWTLlL8xWVL4l7+G9NuvYLQyLzMQkax9qXbJl2lg8rIauu2+KNf/y1ShCTz9XQATS2Bb 0h5uNCXwSE970JHT6bCW5h64FN+0puvHju3xIv6z9X1z00aLG+u4KKmHrweAgK64OfFRw c5KPQ8+hRqR3CLwqfEoZJuifSE5rFswPwaNYnxKxFcPivAMNT8nr+iz1X84kelf0lVPvD ovmHdkr1Ybc6C6Dl9o6uEu3gMzcvxQp3EEwT/OdtOL0FGElDwfeuAGY2ZThECMA72mjJ2 mqhrzCP6/WFPFIGTljexA18y6QBeszVH7p+hPm6QSOo5MWilst5b0kPoZVQZgEMQaLA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794064308; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=ARZWEgiPvBt042VS/Eyf17eiQDLu/pUoeDj+j9Y5YEA=; b=T7uftXp5YPCVN+A8GZKzI6LvDNZLpI2FDjKcwONgKYhl6t6AH2xe0rdvjNbzlFp+eQHW jfbCCVuPpD8yKhadfy75s8Pr4L0f2xWpJ5Ft6N2xS2QhGAA6T5KuTnMvcxpGWEjU8d8Xt qvrniUO+PoBuGBNvWG/VyTCt57ZrnQrBAYzz3HCF3LZomWT3zewcRXQTEcQjkNWFHJM9P ggMxd+ZqgEnZozCA+sMi8fnRmO3mRMoajfcXPHBy9FV8woASLZyKOxAzoqXgw0kAoa9QR yapmHVHwGXCvzqFFaN+irpsuYjgTF5rUvnuAV8Mn7O3YLp8ckaeAoC5Uw/i8+gbC5uQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=Iq1gCTjA; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4505F606C025; Sat, 7 Nov 2026 15:11:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=Iq1gCTjA Received: by smtp.kernel.org (Postfix) with ESMTPSA id E84AD1F0089F; Sat, 7 Nov 2026 15:11:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1794064308; bh=ARZWEgiPvBt042VS/Eyf17eiQDLu/pUoeDj+j9Y5YEA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Iq1gCTjAHAKk+FOUyYiRnC6eKU2vln3F3ECQ56x1LjoUAwL3fZCZBhgGodhHpGNxx gCX2X4SGoWYgAA6Yps2xLUp9COPu5LuuJoGZe+seV2A+BknBiEJgeIdGdiqj3MYe+n qf/4wFEhW6Uct7Srwdcaxrq+dAS456LJC03e70vM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Wentao Liang , Rob Clark , Dmitry Baryshkov , Sasha Levin Subject: [PATCH 7.3 0399/1257] drm/msm/dsi: Fix VM leak in dsi_tx_buf_alloc_6g() Date: Sat, 7 Nov 2026 08:44:55 -0500 Message-ID: <20261107134950.557715505@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261107134939.434104957@linuxfoundation.org> References: <20261107134939.434104957@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 7.3-stable review patch. If anyone has any objections, please let me know. ------------------ From: Wentao Liang [ Upstream commit ab91ba61871a896ca2ecc6e048d80a152136da44 ] 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 Reviewed-by: Rob Clark Patchwork: https://patchwork.freedesktop.org/patch/754332/ Link: https://lore.kernel.org/r/20260916175738.2089950-1-vulab@iscas.ac.cn Signed-off-by: Dmitry Baryshkov Signed-off-by: Sasha Levin --- 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/dsi_host.c index b292dfd266d17..d92659d80f172 100644 --- a/drivers/gpu/drm/msm/dsi/dsi_host.c +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c @@ -1254,6 +1254,8 @@ int dsi_tx_buf_alloc_6g(struct msm_dsi_host *msm_host, int size) if (IS_ERR(data)) { msm_host->tx_gem_obj = NULL; + drm_gpuvm_put(msm_host->vm); + msm_host->vm = NULL; return PTR_ERR(data); } -- 2.53.0