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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>
hifive-unleashed-5.1
Dan Carpenter 2015-03-12 20:24:31 +03:00 committed by Greg Kroah-Hartman
parent edc16d8d48
commit 4bef52f377
4 changed files with 7 additions and 7 deletions
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2
drivers/staging/dgnc/dgnc_cls.c
View File

@ -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];

4
drivers/staging/dgnc/dgnc_mgmt.c
View File

@ -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];

6
drivers/staging/dgnc/dgnc_neo.c
View File

@ -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];

2
drivers/staging/dgnc/dgnc_tty.c
View File

@ -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;
}