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usb: core: Copy parameter string correctly and remove superfluous null check 

strsep() slices string, so the string gets copied by
param_set_copystring() at the end of quirks_param_set() is not the
original value.
Fix that by calling param_set_copystring() earlier.

The null check for val is unnecessary, the caller of quirks_param_set()
does not pass null string.
Remove the superfluous null check. This is found by Smatch.

Fixes: 027bd6cafd ("usb: core: Add "quirks" parameter for usbcore")
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kai-Heng Feng 2018-03-24 03:26:35 +08:00 committed by Greg Kroah-Hartman
parent 73c6d3b284
commit a030501499
1 changed files with 7 additions and 2 deletions
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9
drivers/usb/core/quirks.c
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@ -31,10 +31,15 @@ static int quirks_param_set(const char *val, const struct kernel_param *kp)
u16 vid, pid;
u32 flags;
size_t i;
int err;
err = param_set_copystring(val, kp);
if (err)
return err;
mutex_lock(&quirk_mutex);
if (!val || !*val) {
if (!*val) {
quirk_count = 0;
kfree(quirk_list);
quirk_list = NULL;
@ -133,7 +138,7 @@ static int quirks_param_set(const char *val, const struct kernel_param *kp)
unlock:
mutex_unlock(&quirk_mutex);
return param_set_copystring(val, kp);
return 0;
}
static const struct kernel_param_ops quirks_param_ops = {