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usb: early: xhci-dbc: Fix xdbc number parsing 

kstrtoul() assumes the string contains the number only and is \0
terminated, this is not the case, as such things like:

	earlyprintk=xdbc1,keep

go completely sideways. Use simple_strtoul() instead.

Acked-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220304152136.035911620@infradead.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Zijlstra 2022-03-04 16:19:56 +01:00 committed by Greg Kroah-Hartman
parent b0ae33a2d2
commit 298ac860af
1 changed files with 6 additions and 2 deletions
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8
drivers/usb/early/xhci-dbc.c
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@ -603,6 +603,7 @@ int __init early_xdbc_parse_parameter(char *s, int keep_early)
{
unsigned long dbgp_num = 0;
u32 bus, dev, func, offset;
char *e;
int ret;
if (!early_pci_allowed())
@ -613,8 +614,11 @@ int __init early_xdbc_parse_parameter(char *s, int keep_early)
if (xdbc.xdbc_reg)
return 0;
if (*s && kstrtoul(s, 0, &dbgp_num))
dbgp_num = 0;
if (*s) {
dbgp_num = simple_strtoul(s, &e, 10);
if (s == e)
dbgp_num = 0;
}
pr_notice("dbgp_num: %lu\n", dbgp_num);