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Date: Tue, 12 Apr 2022 08:27:19 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Harry Wentland <harry.wentland@....com>,
Yongzhi Liu <lyz_cs@....edu.cn>,
Alex Deucher <alexander.deucher@....com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.17 021/343] drm/amd/display: Fix memory leak
From: Yongzhi Liu <lyz_cs@....edu.cn>
[ Upstream commit 5d5c6dba2b43e28845d7d7ed32a36802329a5f52 ]
[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 <harry.wentland@....com>
Signed-off-by: Yongzhi Liu <lyz_cs@....edu.cn>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
.../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 26719efa5396..12d437d9a0e4 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;
--
2.35.1
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