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| author | Roel Kluin <roel.kluin@gmail.com> | 2009-10-01 15:44:25 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-10-01 16:11:16 -0700 |
| commit | f23fc156fb4294f678f1913a56da633fa57edb2d (patch) | |
| tree | bc560880e9cf83542a3368963b429912ab218043 /drivers/char/serial167.c | |
| parent | 196b3167efd13a02cdd34acc1a12316b9f45f41d (diff) | |
| download | op-kernel-dev-f23fc156fb4294f678f1913a56da633fa57edb2d.zip op-kernel-dev-f23fc156fb4294f678f1913a56da633fa57edb2d.tar.gz | |
serial167: fix read buffer overflow
Check whether index is within bounds before grabbing the element.
Also, since NR_PORTS is defined ARRAY_SIZE(cy_port), cy_port[NR_PORTS] is
out of bounds as well.
[akpm@linux-foundation.org: cleanup, remove (long) casts]
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char/serial167.c')
| -rw-r--r-- | drivers/char/serial167.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/drivers/char/serial167.c b/drivers/char/serial167.c index 5942a9d..452370a 100644 --- a/drivers/char/serial167.c +++ b/drivers/char/serial167.c @@ -220,8 +220,7 @@ static inline int serial_paranoia_check(struct cyclades_port *info, char *name, return 1; } - if ((long)info < (long)(&cy_port[0]) - || (long)(&cy_port[NR_PORTS]) < (long)info) { + if (info < &cy_port[0] || info >= &cy_port[NR_PORTS]) { printk("Warning: cyclades_port out of range for (%s) in %s\n", name, routine); return 1; @@ -520,15 +519,13 @@ static irqreturn_t cd2401_tx_interrupt(int irq, void *dev_id) panic("TxInt on debug port!!!"); } #endif - - info = &cy_port[channel]; - /* validate the port number (as configured and open) */ if ((channel < 0) || (NR_PORTS <= channel)) { base_addr[CyIER] &= ~(CyTxMpty | CyTxRdy); base_addr[CyTEOIR] = CyNOTRANS; return IRQ_HANDLED; } + info = &cy_port[channel]; info->last_active = jiffies; if (info->tty == 0) { base_addr[CyIER] &= ~(CyTxMpty | CyTxRdy); |
