From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4433E2D9484; Sun, 1 Mar 2026 01:44:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772329483; cv=none; b=mKz/bkcvrxBIhmnENEFNtEx1cFl1BnLcGIKGSz5uUH4y1Wa7c+egVj7reFe4BZsWGKjI+xJLQVK0PABe1tlK22mLi6nnTWrxy/jlcorYI3NetLCJh6PqoNNT4iUZqSi2JfAr3j/X9giP0dpD7rVI/nf+pCFINB94r64ZqBHCC1U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772329483; c=relaxed/simple; bh=UL9K2W1kTjD0BBU0nfv/3OzUPNAlfrXIZhlnFgaUT5s=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=vB1tTviLI0txj386a9HMpP5RZvGcSExpLPokXqQgiXIYRyfokm4fE+EmUAVyXNaxO9NGfWRZZ3c1e7d52ZPzgtW8ILQvP163h09mabVlsJBVOeL1zvSuy3Ft43QkuOVxubw51c8zPHdyu8pimyBCiyK4VuZBkIjcWXt01jB1Q3U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CfulXbdd; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="CfulXbdd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3786CC19424; Sun, 1 Mar 2026 01:44:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772329482; bh=UL9K2W1kTjD0BBU0nfv/3OzUPNAlfrXIZhlnFgaUT5s=; h=From:To:Cc:Subject:Date:From; b=CfulXbdd68SzzaHljG4xb2cbQgp/vB1pZth5lxPXyvFVMykWps19N0FSySZApsc3I HeYa6pvUY84JNGyPuy3d3572p1EWNpLRPLDqRZv+VOnaslMrs4EjHS3Oe2RY+srrG4 QwXtbvTRyU2miGBmdpVDLLDeQmgpFyVaiFiuR0av05hZRIFHNtylT4L0I4QnXJZg0G 2vD+d4HDFYXWEAUv2r+p3QG+4XfKmosgFioFzXnF36V/TjfaB0vxvvhsVb0cKHC4r/ v+YtsQmInxqIZ4ClMXymJZX7POlr9kjZ+zor7AINyy5PQ4FjdXrYnA7EoLnrVPudBM LsgiN2mPzCxkg== From: Sasha Levin To: stable@vger.kernel.org, aha310510@gmail.com Cc: Inki Dae , dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org Subject: FAILED: Patch "drm/exynos: vidi: use ctx->lock to protect struct vidi_context member variables related to memory alloc/free" failed to apply to 6.1-stable tree Date: Sat, 28 Feb 2026 20:44:40 -0500 Message-ID: <20260301014441.1707098-1-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Hint: ignore X-stable: review Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.1-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From 52b330799e2d6f825ae2bb74662ec1b10eb954bb Mon Sep 17 00:00:00 2001 From: Jeongjun Park Date: Mon, 19 Jan 2026 17:25:53 +0900 Subject: [PATCH] drm/exynos: vidi: use ctx->lock to protect struct vidi_context member variables related to memory alloc/free Exynos Virtual Display driver performs memory alloc/free operations without lock protection, which easily causes concurrency problem. For example, use-after-free can occur in race scenario like this: ``` CPU0 CPU1 CPU2 ---- ---- ---- vidi_connection_ioctl() if (vidi->connection) // true drm_edid = drm_edid_alloc(); // alloc drm_edid ... ctx->raw_edid = drm_edid; ... drm_mode_getconnector() drm_helper_probe_single_connector_modes() vidi_get_modes() if (ctx->raw_edid) // true drm_edid_dup(ctx->raw_edid); if (!drm_edid) // false ... vidi_connection_ioctl() if (vidi->connection) // false drm_edid_free(ctx->raw_edid); // free drm_edid ... drm_edid_alloc(drm_edid->edid) kmemdup(edid); // UAF!! ... ``` To prevent these vulns, at least in vidi_context, member variables related to memory alloc/free should be protected with ctx->lock. Cc: Signed-off-by: Jeongjun Park Signed-off-by: Inki Dae --- drivers/gpu/drm/exynos/exynos_drm_vidi.c | 38 ++++++++++++++++++++---- 1 file changed, 32 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/exynos/exynos_drm_vidi.c b/drivers/gpu/drm/exynos/exynos_drm_vidi.c index 9709c07e5d8f4..67bbf9b8bc0ef 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_vidi.c +++ b/drivers/gpu/drm/exynos/exynos_drm_vidi.c @@ -187,29 +187,37 @@ static ssize_t vidi_store_connection(struct device *dev, const char *buf, size_t len) { struct vidi_context *ctx = dev_get_drvdata(dev); - int ret; + int ret, new_connected; - ret = kstrtoint(buf, 0, &ctx->connected); + ret = kstrtoint(buf, 0, &new_connected); if (ret) return ret; - - if (ctx->connected > 1) + if (new_connected > 1) return -EINVAL; + mutex_lock(&ctx->lock); + /* * Use fake edid data for test. If raw_edid is set then it can't be * tested. */ if (ctx->raw_edid) { DRM_DEV_DEBUG_KMS(dev, "edid data is not fake data.\n"); - return -EINVAL; + ret = -EINVAL; + goto fail; } + ctx->connected = new_connected; + mutex_unlock(&ctx->lock); + DRM_DEV_DEBUG_KMS(dev, "requested connection.\n"); drm_helper_hpd_irq_event(ctx->drm_dev); return len; +fail: + mutex_unlock(&ctx->lock); + return ret; } static DEVICE_ATTR(connection, 0644, vidi_show_connection, @@ -244,11 +252,14 @@ int vidi_connection_ioctl(struct drm_device *drm_dev, void *data, return -EINVAL; } + mutex_lock(&ctx->lock); if (ctx->connected == vidi->connection) { + mutex_unlock(&ctx->lock); DRM_DEV_DEBUG_KMS(ctx->dev, "same connection request.\n"); return -EINVAL; } + mutex_unlock(&ctx->lock); if (vidi->connection) { const struct drm_edid *drm_edid; @@ -282,14 +293,21 @@ int vidi_connection_ioctl(struct drm_device *drm_dev, void *data, "edid data is invalid.\n"); return -EINVAL; } + mutex_lock(&ctx->lock); ctx->raw_edid = drm_edid; + mutex_unlock(&ctx->lock); } else { /* with connection = 0, free raw_edid */ + mutex_lock(&ctx->lock); drm_edid_free(ctx->raw_edid); ctx->raw_edid = NULL; + mutex_unlock(&ctx->lock); } + mutex_lock(&ctx->lock); ctx->connected = vidi->connection; + mutex_unlock(&ctx->lock); + drm_helper_hpd_irq_event(ctx->drm_dev); return 0; @@ -304,7 +322,7 @@ static enum drm_connector_status vidi_detect(struct drm_connector *connector, * connection request would come from user side * to do hotplug through specific ioctl. */ - return ctx->connected ? connector_status_connected : + return READ_ONCE(ctx->connected) ? connector_status_connected : connector_status_disconnected; } @@ -327,11 +345,15 @@ static int vidi_get_modes(struct drm_connector *connector) const struct drm_edid *drm_edid; int count; + mutex_lock(&ctx->lock); + if (ctx->raw_edid) drm_edid = drm_edid_dup(ctx->raw_edid); else drm_edid = drm_edid_alloc(fake_edid_info, sizeof(fake_edid_info)); + mutex_unlock(&ctx->lock); + drm_edid_connector_update(connector, drm_edid); count = drm_edid_connector_add_modes(connector); @@ -483,9 +505,13 @@ static void vidi_remove(struct platform_device *pdev) { struct vidi_context *ctx = platform_get_drvdata(pdev); + mutex_lock(&ctx->lock); + drm_edid_free(ctx->raw_edid); ctx->raw_edid = NULL; + mutex_unlock(&ctx->lock); + component_del(&pdev->dev, &vidi_component_ops); } -- 2.51.0