Re: [PATCH] vga_switcheroo: Fix impossible judgment condition

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 2023/10/26 12:44, Dan Carpenter wrote:
On Thu, Oct 26, 2023 at 10:10:57AM +0800, Su Hui wrote:
'id' is enum type like unsigned int, so it will never be less than zero.

Fixes: 4aaf448fa975 ("vga_switcheroo: set audio client id according to bound GPU id")
Signed-off-by: Su Hui <suhui@xxxxxxxxxxxx>
---
  drivers/gpu/vga/vga_switcheroo.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/vga/vga_switcheroo.c b/drivers/gpu/vga/vga_switcheroo.c
index 365e6ddbe90f..d3064466fd3a 100644
--- a/drivers/gpu/vga/vga_switcheroo.c
+++ b/drivers/gpu/vga/vga_switcheroo.c
@@ -375,7 +375,7 @@ int vga_switcheroo_register_audio_client(struct pci_dev *pdev,
  	mutex_lock(&vgasr_mutex);
  	if (vgasr_priv.active) {
  		id = vgasr_priv.handler->get_client_id(vga_dev);
-		if (id < 0) {
+		if ((int)id < 0) {
Hi,

I feel like you're using Smatch?  Which is great!  Fantastic!
Yep, Smatch helps me  a lot to find these bugs! I really like this excellent tool!

Have you built the cross function database?  If you have there is a
command that's useful.
Not yet, bu I want to build this.
$ ~/smatch/smatch_db/smdb.py functions vga_switcheroo_handler get_client_id | tee where
drivers/gpu/drm/nouveau/nouveau_acpi.c | (struct vga_switcheroo_handler)->get_client_id | nouveau_dsm_get_client_id | 1
drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c | (struct vga_switcheroo_handler)->get_client_id | amdgpu_atpx_get_client_id | 1
drivers/gpu/drm/radeon/radeon_atpx_handler.c | (struct vga_switcheroo_handler)->get_client_id | radeon_atpx_get_client_id | 1
drivers/platform/x86/apple-gmux.c | (struct vga_switcheroo_handler)->get_client_id | gmux_get_client_id | 1
$ make cscope
$ vim where
Use cscope to jump to each of those four functions.  Move the cursor to
the nouveau_dsm_get_client_id and hit CTRL-].
Sounds great! I must try this!

They never return negatives.  The enum vga_switcheroo_client_id has a
VGA_SWITCHEROO_UNKNOWN_ID define which I guess these functions are
supposed to return on error.  They never do return that, but I bet
that's what we are supposed to check for.  It honestly might be good
to check for both...

		if ((int)id < 0 || id == VGA_SWITCHEROO_UNKNOWN_ID) {
			mutex_unlock(&vgasr_mutex);
			return -EINVAL;
		}
Agreed, I will send v2 patch soon.
Really thanks for your wonderful suggestion! :)

Su Hui

regards,
dan carpenter




[Index of Archives]     [Linux DRI Users]     [Linux Intel Graphics]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux