From: Anssi Hannula anssi.hannula@bitwise.fi
stable inclusion from stable-v5.10.110 commit c41387f96a223726ca00b011ed3c1e9a645f7ac5 bugzilla: https://gitee.com/openeuler/kernel/issues/I574AL
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit 3105bc977d7cbf2edc35e24cc7e009686f6e4a56 upstream.
xhci_decode_usbsts() is expected to return a zero-terminated string by its only caller, xhci_stop_endpoint_command_watchdog(), which directly logs the return value:
xhci_warn(xhci, "USBSTS:%s\n", xhci_decode_usbsts(str, usbsts));
However, if no recognized bits are set in usbsts, the function will return without having called any sprintf() and therefore return an untouched non-zero-terminated caller-provided buffer, causing garbage to be output to log.
Fix that by always including the raw value in the output.
Note that before commit 4843b4b5ec64 ("xhci: fix even more unsafe memory usage in xhci tracing") the result effect in the failure case was different as a static buffer was used here, but the code still worked incorrectly.
Fixes: 9c1aa36efdae ("xhci: Show host status when watchdog triggers and host is assumed dead.") Cc: stable@vger.kernel.org Signed-off-by: Anssi Hannula anssi.hannula@bitwise.fi Signed-off-by: Mathias Nyman mathias.nyman@linux.intel.com Link: https://lore.kernel.org/r/20220303110903.1662404-3-mathias.nyman@linux.intel... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yu Liao liaoyu15@huawei.com Reviewed-by: Wei Li liwei391@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- drivers/usb/host/xhci.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 679ef073d99d..0f2f903512d0 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -2614,8 +2614,11 @@ static inline const char *xhci_decode_usbsts(char *str, u32 usbsts) { int ret = 0;
+ ret = sprintf(str, " 0x%08x", usbsts); + if (usbsts == ~(u32)0) - return " 0xffffffff"; + return str; + if (usbsts & STS_HALT) ret += sprintf(str + ret, " HCHalted"); if (usbsts & STS_FATAL)