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i2c: dev: Fix memory leak when underlying adapter does not support I2C

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[ Upstream commit 48730a9d04ffccda541602d722d1ff81920a85d8 ]

Early return in i2cdev_ioctl_rdwr() failed to free the memory allocated
by the caller. Move freeing the memory to the function where it has been
allocated to prevent similar leaks in the future.

Fixes: 97ca843f6a ("i2c: dev: Check for I2C_FUNC_I2C before calling i2c_transfer")
Signed-off-by: Igor Pylypiv <ipylypiv@google.com>
[wsa: replaced '== NULL' with '!']
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Igor Pylypiv
2024-11-08 00:15:42 +00:00
committed by Greg Kroah-Hartman
parent 57860a80f0
commit 5556876be9
1 changed files with 9 additions and 8 deletions
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drivers/i2c/i2c-dev.c
+9 -8
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@@ -251,10 +251,8 @@ static noinline int i2cdev_ioctl_rdwr(struct i2c_client *client,
return -EOPNOTSUPP;
data_ptrs = kmalloc_array(nmsgs, sizeof(u8 __user *), GFP_KERNEL);
if (data_ptrs == NULL) {
kfree(msgs);
if (!data_ptrs)
return -ENOMEM;
}
res = 0;
for (i = 0; i < nmsgs; i++) {
@@ -302,7 +300,6 @@ static noinline int i2cdev_ioctl_rdwr(struct i2c_client *client,
for (j = 0; j < i; ++j)
kfree(msgs[j].buf);
kfree(data_ptrs);
kfree(msgs);
return res;
}
@@ -316,7 +313,6 @@ static noinline int i2cdev_ioctl_rdwr(struct i2c_client *client,
kfree(msgs[i].buf);
}
kfree(data_ptrs);
kfree(msgs);
return res;
}
@@ -446,6 +442,7 @@ static long i2cdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case I2C_RDWR: {
struct i2c_rdwr_ioctl_data rdwr_arg;
struct i2c_msg *rdwr_pa;
int res;
if (copy_from_user(&rdwr_arg,
(struct i2c_rdwr_ioctl_data __user *)arg,
@@ -467,7 +464,9 @@ static long i2cdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
if (IS_ERR(rdwr_pa))
return PTR_ERR(rdwr_pa);
return i2cdev_ioctl_rdwr(client, rdwr_arg.nmsgs, rdwr_pa);
res = i2cdev_ioctl_rdwr(client, rdwr_arg.nmsgs, rdwr_pa);
kfree(rdwr_pa);
return res;
}
case I2C_SMBUS: {
@@ -540,7 +539,7 @@ static long compat_i2cdev_ioctl(struct file *file, unsigned int cmd, unsigned lo
struct i2c_rdwr_ioctl_data32 rdwr_arg;
struct i2c_msg32 __user *p;
struct i2c_msg *rdwr_pa;
int i;
int i, res;
if (copy_from_user(&rdwr_arg,
(struct i2c_rdwr_ioctl_data32 __user *)arg,
@@ -573,7 +572,9 @@ static long compat_i2cdev_ioctl(struct file *file, unsigned int cmd, unsigned lo
};
}
return i2cdev_ioctl_rdwr(client, rdwr_arg.nmsgs, rdwr_pa);
res = i2cdev_ioctl_rdwr(client, rdwr_arg.nmsgs, rdwr_pa);
kfree(rdwr_pa);
return res;
}
case I2C_SMBUS: {
struct i2c_smbus_ioctl_data32 data32;