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| author | Jesper Juhl <jj@chaosbits.net> | 2011-02-13 10:49:32 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-02-13 16:55:46 -0800 |
| commit | da1ab3e233eb1ff4116b178006a89ddca7dcd928 (patch) | |
| tree | 72af09bc5dac22d6a160715691a40b24b341ce4c /drivers/atm | |
| parent | 5b89db0e84bef81f6aa324f8f22a9258ff873de3 (diff) | |
| download | lwn-da1ab3e233eb1ff4116b178006a89ddca7dcd928.tar.gz lwn-da1ab3e233eb1ff4116b178006a89ddca7dcd928.zip | |
ATM, Solos PCI ADSL2+: Don't deref NULL pointer if net_ratelimit() and alloc_skb() interact badly.
If alloc_skb() fails to allocate memory and returns NULL then we want to
return -ENOMEM from drivers/atm/solos-pci.c::popen() regardless of the
value of net_ratelimit(). The way the code is today, we may not return if
net_ratelimit() returns 0, then we'll proceed to pass a NULL pointer to
skb_put() which will blow up in our face.
This patch ensures that we always return -ENOMEM on alloc_skb() failure
and only let the dev_warn() be controlled by the value of net_ratelimit().
Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/atm')
| -rw-r--r-- | drivers/atm/solos-pci.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/atm/solos-pci.c b/drivers/atm/solos-pci.c index 73fb1c4f4cd4..25ef1a4556e6 100644 --- a/drivers/atm/solos-pci.c +++ b/drivers/atm/solos-pci.c @@ -866,8 +866,9 @@ static int popen(struct atm_vcc *vcc) } skb = alloc_skb(sizeof(*header), GFP_ATOMIC); - if (!skb && net_ratelimit()) { - dev_warn(&card->dev->dev, "Failed to allocate sk_buff in popen()\n"); + if (!skb) { + if (net_ratelimit()) + dev_warn(&card->dev->dev, "Failed to allocate sk_buff in popen()\n"); return -ENOMEM; } header = (void *)skb_put(skb, sizeof(*header)); |