From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3DF21F5A8DE for ; Wed, 22 Apr 2026 08:27:34 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 70EAA10E978; Wed, 22 Apr 2026 08:27:33 +0000 (UTC) X-Greylist: delayed 468 seconds by postgrey-1.36 at gabe; Tue, 21 Apr 2026 13:30:02 UTC Received: from air.basealt.ru (air.basealt.ru [193.43.8.18]) by gabe.freedesktop.org (Postfix) with ESMTPS id 6EDF010E1E1 for ; Tue, 21 Apr 2026 13:30:02 +0000 (UTC) Received: from altlinux.ipa.basealt.ru (unknown [193.43.11.2]) (Authenticated sender: kovalevvv) by air.basealt.ru (Postfix) with ESMTPSA id 448DA2338E; Tue, 21 Apr 2026 16:22:11 +0300 (MSK) From: Vasiliy Kovalev To: stable@vger.kernel.org Cc: Alex Deucher , Leo Li , amd-gfx@lists.freedesktop.org, lvc-project@linuxtesting.org, kovalev@altlinux.org Subject: [PATCH 5.10.y] drm/amd/display: Fix memory leak Date: Tue, 21 Apr 2026 16:22:10 +0300 Message-Id: <20260421132210.38325-1-kovalev@altlinux.org> X-Mailer: git-send-email 2.33.8 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Mailman-Approved-At: Wed, 22 Apr 2026 08:27:32 +0000 X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" From: Yongzhi Liu commit 5d5c6dba2b43e28845d7d7ed32a36802329a5f52 upstream. [why] Resource release is needed on the error handling path to prevent memory leak. [how] Fix this by adding kfree on the error handling path. Reviewed-by: Harry Wentland Signed-off-by: Yongzhi Liu Signed-off-by: Alex Deucher Fixes: f8ac2cf78f27 ("drm/amd/display: Linux set/read lane settings through debugfs") Fixes: c06e09b76639 ("drm/amd/display: Add DSC parameters logging to debugfs") [ kovalev: bp to fix CVE-2022-49135; added Fixes tags ] Signed-off-by: Vasiliy Kovalev --- .../amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 72 ++++++++++++++----- 1 file changed, 54 insertions(+), 18 deletions(-) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c index 6914738f0275..f4a1ad8959b7 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c @@ -229,8 +229,10 @@ static ssize_t dp_link_settings_read(struct file *f, char __user *buf, break; r = put_user(*(rd_buf + result), buf); - if (r) + if (r) { + kfree(rd_buf); return r; /* r = -EFAULT */ + } buf += 1; size -= 1; @@ -388,8 +390,10 @@ static ssize_t dp_phy_settings_read(struct file *f, char __user *buf, break; r = put_user((*(rd_buf + result)), buf); - if (r) + if (r) { + kfree(rd_buf); return r; /* r = -EFAULT */ + } buf += 1; size -= 1; @@ -1195,8 +1199,10 @@ static ssize_t dp_dsc_clock_en_read(struct file *f, char __user *buf, break; } - if (!pipe_ctx) + if (!pipe_ctx) { + kfree(rd_buf); return -ENXIO; + } dsc = pipe_ctx->stream_res.dsc; if (dsc) @@ -1212,8 +1218,10 @@ static ssize_t dp_dsc_clock_en_read(struct file *f, char __user *buf, break; r = put_user(*(rd_buf + result), buf); - if (r) + if (r) { + kfree(rd_buf); return r; /* r = -EFAULT */ + } buf += 1; size -= 1; @@ -1351,8 +1359,10 @@ static ssize_t dp_dsc_slice_width_read(struct file *f, char __user *buf, break; } - if (!pipe_ctx) + if (!pipe_ctx) { + kfree(rd_buf); return -ENXIO; + } dsc = pipe_ctx->stream_res.dsc; if (dsc) @@ -1368,8 +1378,10 @@ static ssize_t dp_dsc_slice_width_read(struct file *f, char __user *buf, break; r = put_user(*(rd_buf + result), buf); - if (r) + if (r) { + kfree(rd_buf); return r; /* r = -EFAULT */ + } buf += 1; size -= 1; @@ -1505,8 +1517,10 @@ static ssize_t dp_dsc_slice_height_read(struct file *f, char __user *buf, break; } - if (!pipe_ctx) + if (!pipe_ctx) { + kfree(rd_buf); return -ENXIO; + } dsc = pipe_ctx->stream_res.dsc; if (dsc) @@ -1522,8 +1536,10 @@ static ssize_t dp_dsc_slice_height_read(struct file *f, char __user *buf, break; r = put_user(*(rd_buf + result), buf); - if (r) + if (r) { + kfree(rd_buf); return r; /* r = -EFAULT */ + } buf += 1; size -= 1; @@ -1655,8 +1671,10 @@ static ssize_t dp_dsc_bits_per_pixel_read(struct file *f, char __user *buf, break; } - if (!pipe_ctx) + if (!pipe_ctx) { + kfree(rd_buf); return -ENXIO; + } dsc = pipe_ctx->stream_res.dsc; if (dsc) @@ -1672,8 +1690,10 @@ static ssize_t dp_dsc_bits_per_pixel_read(struct file *f, char __user *buf, break; r = put_user(*(rd_buf + result), buf); - if (r) + if (r) { + kfree(rd_buf); return r; /* r = -EFAULT */ + } buf += 1; size -= 1; @@ -1800,8 +1820,10 @@ static ssize_t dp_dsc_pic_width_read(struct file *f, char __user *buf, break; } - if (!pipe_ctx) + if (!pipe_ctx) { + kfree(rd_buf); return -ENXIO; + } dsc = pipe_ctx->stream_res.dsc; if (dsc) @@ -1817,8 +1839,10 @@ static ssize_t dp_dsc_pic_width_read(struct file *f, char __user *buf, break; r = put_user(*(rd_buf + result), buf); - if (r) + if (r) { + kfree(rd_buf); return r; /* r = -EFAULT */ + } buf += 1; size -= 1; @@ -1857,8 +1881,10 @@ static ssize_t dp_dsc_pic_height_read(struct file *f, char __user *buf, break; } - if (!pipe_ctx) + if (!pipe_ctx) { + kfree(rd_buf); return -ENXIO; + } dsc = pipe_ctx->stream_res.dsc; if (dsc) @@ -1874,8 +1900,10 @@ static ssize_t dp_dsc_pic_height_read(struct file *f, char __user *buf, break; r = put_user(*(rd_buf + result), buf); - if (r) + if (r) { + kfree(rd_buf); return r; /* r = -EFAULT */ + } buf += 1; size -= 1; @@ -1929,8 +1957,10 @@ static ssize_t dp_dsc_chunk_size_read(struct file *f, char __user *buf, break; } - if (!pipe_ctx) + if (!pipe_ctx) { + kfree(rd_buf); return -ENXIO; + } dsc = pipe_ctx->stream_res.dsc; if (dsc) @@ -1946,8 +1976,10 @@ static ssize_t dp_dsc_chunk_size_read(struct file *f, char __user *buf, break; r = put_user(*(rd_buf + result), buf); - if (r) + if (r) { + kfree(rd_buf); return r; /* r = -EFAULT */ + } buf += 1; size -= 1; @@ -2001,8 +2033,10 @@ static ssize_t dp_dsc_slice_bpg_offset_read(struct file *f, char __user *buf, break; } - if (!pipe_ctx) + if (!pipe_ctx) { + kfree(rd_buf); return -ENXIO; + } dsc = pipe_ctx->stream_res.dsc; if (dsc) @@ -2018,8 +2052,10 @@ static ssize_t dp_dsc_slice_bpg_offset_read(struct file *f, char __user *buf, break; r = put_user(*(rd_buf + result), buf); - if (r) + if (r) { + kfree(rd_buf); return r; /* r = -EFAULT */ + } buf += 1; size -= 1; -- 2.50.1