In the npcm_i2c_reg_slave() function, there was a redundant
comparison that checked if 'bus->slave' was null immediately after
assigning it the 'client' value. There were concerns about a
potential null dereference because of `client->adapter`, but
according to Wolfram Sang, "we trusted ourselves here" Therefore,
this comparison is unnecessary.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Signed-off-by: Rand Deeb <[email protected]>
---
drivers/i2c/busses/i2c-npcm7xx.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/drivers/i2c/busses/i2c-npcm7xx.c b/drivers/i2c/busses/i2c-npcm7xx.c
index c1b679737240..bdf35b86e559 100644
--- a/drivers/i2c/busses/i2c-npcm7xx.c
+++ b/drivers/i2c/busses/i2c-npcm7xx.c
@@ -1247,9 +1247,6 @@ static int npcm_i2c_reg_slave(struct i2c_client *client)
bus->slave = client;
- if (!bus->slave)
- return -EINVAL;
-
if (client->flags & I2C_CLIENT_TEN)
return -EAFNOSUPPORT;
--
2.34.1
On Tue, Feb 06, 2024 at 10:42:01PM +0300, Rand Deeb wrote:
> In the npcm_i2c_reg_slave() function, there was a redundant
> comparison that checked if 'bus->slave' was null immediately after
> assigning it the 'client' value. There were concerns about a
> potential null dereference because of `client->adapter`, but
> according to Wolfram Sang, "we trusted ourselves here" Therefore,
> this comparison is unnecessary.
>
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
>
> Signed-off-by: Rand Deeb <[email protected]>
Reviewed-by: Wolfram Sang <[email protected]>
Hi
On Tue, 06 Feb 2024 22:42:01 +0300, Rand Deeb wrote:
> In the npcm_i2c_reg_slave() function, there was a redundant
> comparison that checked if 'bus->slave' was null immediately after
> assigning it the 'client' value. There were concerns about a
> potential null dereference because of `client->adapter`, but
> according to Wolfram Sang, "we trusted ourselves here" Therefore,
> this comparison is unnecessary.
>
> [...]
Applied to i2c/i2c-host on
git://git.kernel.org/pub/scm/linux/kernel/git/andi.shyti/linux.git
Thank you,
Andi
Patches applied
===============
[1/1] i2c: Remove redundant comparison in npcm_i2c_reg_slave
commit: 48acf8292280f257fb0047478153a81471ee7f4d