From: Luben Tuikov <luben.tuikov@amd.com>
To: Dan Carpenter <dan.carpenter@oracle.com>,
Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>,
"Pan, Xinhui" <Xinhui.Pan@amd.com>,
"David Airlie" <airlied@linux.ie>,
"Daniel Vetter" <daniel@ffwll.ch>,
"Hawking Zhang" <Hawking.Zhang@amd.com>,
"Guchun Chen" <guchun.chen@amd.com>,
"John Clements" <john.clements@amd.com>,
"Dennis Li" <Dennis.Li@amd.com>,
amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
kernel-janitors@vger.kernel.org
Subject: Re: [PATCH 1/4] drm/amdgpu: fix a signedness bug in __verify_ras_table_checksum()
Date: Sun, 4 Jul 2021 11:18:34 -0400 [thread overview]
Message-ID: <bb78075f-2249-8311-2f75-c0dfaa333ec4@amd.com> (raw)
In-Reply-To: <YOAsdyWeZAHF0oll@mwanda>
Series is,
Reviewed-by: Luben Tuikov <luben.tuikov@amd.com>
Regards,
Luben
On 2021-07-03 5:44 a.m., Dan Carpenter wrote:
> If amdgpu_eeprom_read() returns a negative error code then the error
> handling checks:
>
> if (res < buf_size) {
>
> The problem is that "buf_size" is a u32 so negative values are type
> promoted to a high positive values and the condition is false. Fix
> this by changing the type of "buf_size" to int.
>
> Fixes: 79beb6114014 ("drm/amdgpu: Optimize EEPROM RAS table I/O")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> ---
> It's hard for me to tell the exact upper bound that "buf_size" can be,
> but if it's over USHRT_MAX then we are well toasted.
>
> drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
> index fc70620369e4..f07a456506ef 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
> @@ -978,9 +978,8 @@ const struct file_operations amdgpu_ras_debugfs_eeprom_table_ops = {
> static int __verify_ras_table_checksum(struct amdgpu_ras_eeprom_control *control)
> {
> struct amdgpu_device *adev = to_amdgpu_device(control);
> - int res;
> + int buf_size, res;
> u8 csum, *buf, *pp;
> - u32 buf_size;
>
> buf_size = RAS_TABLE_HEADER_SIZE +
> control->ras_num_recs * RAS_TABLE_RECORD_SIZE;
next prev parent reply other threads:[~2021-07-04 15:18 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-03 9:44 [PATCH 1/4] drm/amdgpu: fix a signedness bug in __verify_ras_table_checksum() Dan Carpenter
2021-07-03 9:44 ` [PATCH 2/4] drm/amdgpu: Fix signedness bug in __amdgpu_eeprom_xfer() Dan Carpenter
2021-07-03 9:45 ` [PATCH 3/4] drm/amdgpu: unlock on error in amdgpu_ras_debugfs_table_read() Dan Carpenter
2021-07-03 9:46 ` [PATCH 4/4] drm/amdgpu: return -EFAULT if copy_to_user() fails Dan Carpenter
2021-07-04 15:18 ` Luben Tuikov [this message]
2021-07-06 0:52 ` [PATCH 1/4] drm/amdgpu: fix a signedness bug in __verify_ras_table_checksum() Luben Tuikov
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