Char: ipmi_bt_sm, fix infinite loop

In read_all_bytes, we do

  unsigned char i;
  ...
  bt->read_data[0] = BMC2HOST;
  bt->read_count = bt->read_data[0];
  ...
  for (i = 1; i <= bt->read_count; i++)
    bt->read_data[i] = BMC2HOST;

If bt->read_data[0] == bt->read_count == 255, we loop infinitely in the
'for' loop.  Make 'i' an 'int' instead of 'char' to get rid of the
overflow and finish the loop after 255 iterations every time.

Signed-off-by: Jiri Slaby <[email protected]>
Reported-and-debugged-by: Rui Hui Dian <[email protected]>
Cc: Tomas Cech <[email protected]>
Cc: Corey Minyard <[email protected]>
Cc: <[email protected]>
Signed-off-by: Corey Minyard <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/drivers/char/ipmi/ipmi_bt_sm.c b/drivers/char/ipmi/ipmi_bt_sm.c
index f5e4cd7617f689fc11c4cb6ee49c58fb8818479a..61e71616689b7c3bd5441230b5af30df79df837c 100644 (file)
--- a/drivers/char/ipmi/ipmi_bt_sm.c
+++ b/drivers/char/ipmi/ipmi_bt_sm.c
@@ -352,7 +352,7 @@ static inline void write_all_bytes(struct si_sm_data *bt)
 
 static inline int read_all_bytes(struct si_sm_data *bt)
 {
-       unsigned char i;
+       unsigned int i;
 
        /*
         * length is "framing info", minimum = 4: NetFn, Seq, Cmd, cCode.