staging: dgnc: some off by one bugs

"dgnc_NumBoards" is the number of filled out elements in the
dgnc_Board[] array.  "->nasync" and "->maxports" are the same value.
They are the number of channels in the ->channels[] array so these tests
should be ">=" instead of ">" so we avoid reading past the end of the
arrays.

I cleaned up the conditions in dgnc_mgmt_ioctl() a bit.  There was a
work around for the off by one bug in the case where there were no
boards which is no longer needed.  "channel" is unsigned so it can't be
negative.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/dgnc/dgnc_cls.c b/drivers/staging/dgnc/dgnc_cls.c
index 66397d6..e3564d2 100644 (file)
--- a/drivers/staging/dgnc/dgnc_cls.c
+++ b/drivers/staging/dgnc/dgnc_cls.c
@@ -375,7 +375,7 @@ static inline void cls_parse_isr(struct dgnc_board *brd, uint port)
         * verified in the interrupt routine.
         */
 
-       if (port > brd->nasync)
+       if (port >= brd->nasync)
                return;
 
        ch = brd->channels[port];

diff --git a/drivers/staging/dgnc/dgnc_mgmt.c b/drivers/staging/dgnc/dgnc_mgmt.c
index 5781406..34b6efd 100644 (file)
--- a/drivers/staging/dgnc/dgnc_mgmt.c
+++ b/drivers/staging/dgnc/dgnc_mgmt.c
@@ -179,11 +179,11 @@ long dgnc_mgmt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
                channel = ni.channel;
 
                /* Verify boundaries on board */
-               if ((board > dgnc_NumBoards) || (dgnc_NumBoards == 0))
+               if (board >= dgnc_NumBoards)
                        return -ENODEV;
 
                /* Verify boundaries on channel */
-               if ((channel < 0) || (channel > dgnc_Board[board]->nasync))
+               if (channel >= dgnc_Board[board]->nasync)
                        return -ENODEV;
 
                ch = dgnc_Board[board]->channels[channel];

diff --git a/drivers/staging/dgnc/dgnc_neo.c b/drivers/staging/dgnc/dgnc_neo.c
index 41105be..f5a4d36 100644 (file)
--- a/drivers/staging/dgnc/dgnc_neo.c
+++ b/drivers/staging/dgnc/dgnc_neo.c
@@ -391,7 +391,7 @@ static inline void neo_parse_isr(struct dgnc_board *brd, uint port)
        if (!brd || brd->magic != DGNC_BOARD_MAGIC)
                return;
 
-       if (port > brd->maxports)
+       if (port >= brd->maxports)
                return;
 
        ch = brd->channels[port];
@@ -521,7 +521,7 @@ static inline void neo_parse_lsr(struct dgnc_board *brd, uint port)
        if (!brd || brd->magic != DGNC_BOARD_MAGIC)
                return;
 
-       if (port > brd->maxports)
+       if (port >= brd->maxports)
                return;
 
        ch = brd->channels[port];
@@ -1003,7 +1003,7 @@ static irqreturn_t neo_intr(int irq, void *voidbrd)
                         */
 
                        /* Verify the port is in range. */
-                       if (port > brd->nasync)
+                       if (port >= brd->nasync)
                                continue;
 
                        ch = brd->channels[port];

diff --git a/drivers/staging/dgnc/dgnc_tty.c b/drivers/staging/dgnc/dgnc_tty.c
index f1c4d07..5b8d7b5 100644 (file)
--- a/drivers/staging/dgnc/dgnc_tty.c
+++ b/drivers/staging/dgnc/dgnc_tty.c
@@ -1042,7 +1042,7 @@ static int dgnc_tty_open(struct tty_struct *tty, struct file *file)
        spin_lock_irqsave(&brd->bd_lock, flags);
 
        /* If opened device is greater than our number of ports, bail. */
-       if (PORT_NUM(minor) > brd->nasync) {
+       if (PORT_NUM(minor) >= brd->nasync) {
                spin_unlock_irqrestore(&brd->bd_lock, flags);
                return -ENXIO;
        }