[Public]
Applied. Thanks! ________________________________ From: Wentland, Harry Harry.Wentland@amd.com Sent: Friday, January 21, 2022 2:03 PM To: Yongzhi Liu lyz_cs@pku.edu.cn; Li, Sun peng (Leo) Sunpeng.Li@amd.com; Siqueira, Rodrigo Rodrigo.Siqueira@amd.com; Deucher, Alexander Alexander.Deucher@amd.com; Koenig, Christian Christian.Koenig@amd.com; Pan, Xinhui Xinhui.Pan@amd.com; airlied@linux.ie airlied@linux.ie; daniel@ffwll.ch daniel@ffwll.ch; Lipski, Mikita Mikita.Lipski@amd.com; Lin, Wayne Wayne.Lin@amd.com; Kazlauskas, Nicholas Nicholas.Kazlauskas@amd.com; Zuo, Jerry Jerry.Zuo@amd.com; Anson.Jacob@amd.com Anson.Jacob@amd.com; eryk.brol@amd.com eryk.brol@amd.com; Pillai, Aurabindo Aurabindo.Pillai@amd.com; Das, Nirmoy Nirmoy.Das@amd.com Cc: amd-gfx@lists.freedesktop.org amd-gfx@lists.freedesktop.org; dri-devel@lists.freedesktop.org dri-devel@lists.freedesktop.org; linux-kernel@vger.kernel.org linux-kernel@vger.kernel.org Subject: Re: [PATCH] drm/amd/display: Fix memory leak
On 2022-01-21 06:26, Yongzhi Liu wrote:
[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.
Signed-off-by: Yongzhi Liu lyz_cs@pku.edu.cn
Reviewed-by: Harry Wentland harry.wentland@amd.com
Harry
.../drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 80 ++++++++++++++++------ 1 file changed, 60 insertions(+), 20 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 ded64d0..e463d46 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 @@ -227,8 +227,10 @@ 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;@@ -389,8 +391,10 @@ 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;@@ -1359,8 +1363,10 @@ 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)@@ -1376,8 +1382,10 @@ 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;@@ -1546,8 +1554,10 @@ 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)@@ -1563,8 +1573,10 @@ 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;@@ -1731,8 +1743,10 @@ 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)@@ -1748,8 +1762,10 @@ 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;@@ -1912,8 +1928,10 @@ 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)@@ -1929,8 +1947,10 @@ 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;@@ -2088,8 +2108,10 @@ 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)@@ -2105,8 +2127,10 @@ 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;@@ -2145,8 +2169,10 @@ 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)@@ -2162,8 +2188,10 @@ 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;@@ -2217,8 +2245,10 @@ 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)@@ -2234,8 +2264,10 @@ 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;@@ -2289,8 +2321,10 @@ 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)@@ -2306,8 +2340,10 @@ 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;@@ -3459,8 +3495,10 @@ static ssize_t dcc_en_bits_read( dc->hwss.get_dcc_en_bits(dc, dcc_en_bits);
rd_buf = kcalloc(rd_buf_size, sizeof(char), GFP_KERNEL);
if (!rd_buf)
if (!rd_buf) {kfree(dcc_en_bits); return -ENOMEM;} for (i = 0; i < num_pipes; i++) offset += snprintf(rd_buf + offset, rd_buf_size - offset,@@ -3473,8 +3511,10 @@ static ssize_t dcc_en_bits_read( if (*pos >= rd_buf_size) break; r = put_user(*(rd_buf + result), buf);
if (r)
if (r) {kfree(rd_buf); return r; /* r = -EFAULT */} buf += 1; size -= 1; *pos += 1;