diff options
| author | Roel Kluin <roel.kluin@gmail.com> | 2009-02-12 16:52:31 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-02-12 16:52:31 -0800 |
| commit | 501aa061bd68169a5b54c123641f8dfa9ad31545 (patch) | |
| tree | c3824d1b8e3085566748b29fbfd9186d916119a3 | |
| parent | f82da723398ff18d49275a5f03de6cae5f592e8e (diff) | |
| download | op-kernel-dev-501aa061bd68169a5b54c123641f8dfa9ad31545.zip op-kernel-dev-501aa061bd68169a5b54c123641f8dfa9ad31545.tar.gz | |
3c505: do not set pcb->data.raw beyond its size
Ensure that we do not set pcb->data.raw beyond its size, print an error message
and return false if we attempt to. A timout message was printed one too early.
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/3c505.c | 26 |
1 files changed, 16 insertions, 10 deletions
diff --git a/drivers/net/3c505.c b/drivers/net/3c505.c index 6124605..a8107f9 100644 --- a/drivers/net/3c505.c +++ b/drivers/net/3c505.c @@ -493,21 +493,27 @@ static bool receive_pcb(struct net_device *dev, pcb_struct * pcb) } /* read the data */ spin_lock_irqsave(&adapter->lock, flags); - i = 0; - do { - j = 0; - while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && j++ < 20000); - pcb->data.raw[i++] = inb_command(dev->base_addr); - if (i > MAX_PCB_DATA) - INVALID_PCB_MSG(i); - } while ((stat & ASF_PCB_MASK) != ASF_PCB_END && j < 20000); + for (i = 0; i < MAX_PCB_DATA; i++) { + for (j = 0; j < 20000; j++) { + stat = get_status(dev->base_addr); + if (stat & ACRF) + break; + } + pcb->data.raw[i] = inb_command(dev->base_addr); + if ((stat & ASF_PCB_MASK) == ASF_PCB_END || j >= 20000) + break; + } spin_unlock_irqrestore(&adapter->lock, flags); + if (i >= MAX_PCB_DATA) { + INVALID_PCB_MSG(i); + return false; + } if (j >= 20000) { TIMEOUT_MSG(__LINE__); return false; } - /* woops, the last "data" byte was really the length! */ - total_length = pcb->data.raw[--i]; + /* the last "data" byte was really the length! */ + total_length = pcb->data.raw[i]; /* safety check total length vs data length */ if (total_length != (pcb->length + 2)) { |
