4.19-stable patches

added patches:
	usb-serial-f81534-fix-division-by-zero-on-line-speed-change.patch

diff --git a/queue-4.19/series b/queue-4.19/series
index d795c3628d31cea0b4d5ad1cbf5c998ebabb143a..d5fc2358e6c7041699f6b15df8e4608593236f87 100644 (file)
--- a/queue-4.19/series
+++ b/queue-4.19/series
@@ -15,3 +15,4 @@ udf-fix-extending-file-within-last-block.patch
 usb-gadget-uvc-prevent-buffer-overflow-in-setup-handler.patch
 usb-serial-option-add-quectel-em05-g-modem.patch
 usb-serial-cp210x-add-kamstrup-rf-sniffer-pids.patch
+usb-serial-f81534-fix-division-by-zero-on-line-speed-change.patch

diff --git a/queue-4.19/usb-serial-f81534-fix-division-by-zero-on-line-speed-change.patch b/queue-4.19/usb-serial-f81534-fix-division-by-zero-on-line-speed-change.patch
new file mode 100644 (file)
index 0000000..def9ce6
--- /dev/null
+++ b/queue-4.19/usb-serial-f81534-fix-division-by-zero-on-line-speed-change.patch
@@ -0,0 +1,52 @@
+From 188c9c2e0c7f4ae864113f80c40bafb394062271 Mon Sep 17 00:00:00 2001
+From: Johan Hovold <johan@kernel.org>
+Date: Tue, 29 Nov 2022 15:18:19 +0100
+Subject: USB: serial: f81534: fix division by zero on line-speed change
+
+From: Johan Hovold <johan@kernel.org>
+
+commit 188c9c2e0c7f4ae864113f80c40bafb394062271 upstream.
+
+The driver leaves the line speed unchanged in case a requested speed is
+not supported. Make sure to handle the case where the current speed is
+B0 (hangup) without dividing by zero when determining the clock source.
+
+Fixes: 3aacac02f385 ("USB: serial: f81534: add high baud rate support")
+Cc: stable@vger.kernel.org      # 4.16
+Cc: Ji-Ze Hong (Peter Hong) <hpeter@gmail.com>
+Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Signed-off-by: Johan Hovold <johan@kernel.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/usb/serial/f81534.c |   12 +++++++-----
+ 1 file changed, 7 insertions(+), 5 deletions(-)
+
+--- a/drivers/usb/serial/f81534.c
++++ b/drivers/usb/serial/f81534.c
+@@ -538,9 +538,6 @@ static int f81534_submit_writer(struct u
+ 
+ static u32 f81534_calc_baud_divisor(u32 baudrate, u32 clockrate)
+ {
+-      if (!baudrate)
+-              return 0;
+-
+       /* Round to nearest divisor */
+       return DIV_ROUND_CLOSEST(clockrate, baudrate);
+ }
+@@ -570,9 +567,14 @@ static int f81534_set_port_config(struct
+       u32 baud_list[] = {baudrate, old_baudrate, F81534_DEFAULT_BAUD_RATE};
+ 
+       for (i = 0; i < ARRAY_SIZE(baud_list); ++i) {
+-              idx = f81534_find_clk(baud_list[i]);
++              baudrate = baud_list[i];
++              if (baudrate == 0) {
++                      tty_encode_baud_rate(tty, 0, 0);
++                      return 0;
++              }
++
++              idx = f81534_find_clk(baudrate);
+               if (idx >= 0) {
+-                      baudrate = baud_list[i];
+                       tty_encode_baud_rate(tty, baudrate, baudrate);
+                       break;
+               }