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| author | David S. Miller <davem@sunset.davemloft.net> | 2005-12-27 13:57:59 -0800 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2005-12-27 13:57:59 -0800 |
| commit | 1b93ae64cabe5e28dd5a1f35f96f938ca4f6ae20 (patch) | |
| tree | a8c5c7d08e6c658853245ad0b0cf47f0af1ff83d | |
| parent | 6732badee0dad467fcc9dd0168af8677b2b1bc2f (diff) | |
| download | linux-1b93ae64cabe5e28dd5a1f35f96f938ca4f6ae20.tar.gz linux-1b93ae64cabe5e28dd5a1f35f96f938ca4f6ae20.tar.bz2 linux-1b93ae64cabe5e28dd5a1f35f96f938ca4f6ae20.zip | |
[NET]: Validate socket filters against BPF_MAXINSNS in one spot.
Currently the checks are scattered all over and this leads
to inconsistencies and even cases where the check is not made.
Based upon a patch from Kris Katterjohn.
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ppp_generic.c | 3 | ||||
| -rw-r--r-- | net/core/filter.c | 4 |
2 files changed, 2 insertions, 5 deletions
diff --git a/drivers/net/ppp_generic.c b/drivers/net/ppp_generic.c index 50430f79f8cf..1c6d328165bb 100644 --- a/drivers/net/ppp_generic.c +++ b/drivers/net/ppp_generic.c @@ -524,9 +524,6 @@ static int get_filter(void __user *arg, struct sock_filter **p) if (copy_from_user(&uprog, arg, sizeof(uprog))) return -EFAULT; - if (uprog.len > BPF_MAXINSNS) - return -EINVAL; - if (!uprog.len) { *p = NULL; return 0; diff --git a/net/core/filter.c b/net/core/filter.c index 2841bfce29d6..3a10e0bc90e8 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -293,7 +293,7 @@ int sk_chk_filter(struct sock_filter *filter, int flen) struct sock_filter *ftest; int pc; - if (((unsigned int)flen >= (~0U / sizeof(struct sock_filter))) || flen == 0) + if (flen == 0 || flen > BPF_MAXINSNS) return -EINVAL; /* check the filter code now */ @@ -360,7 +360,7 @@ int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk) int err; /* Make sure new filter is there and in the right amounts. */ - if (fprog->filter == NULL || fprog->len > BPF_MAXINSNS) + if (fprog->filter == NULL) return -EINVAL; fp = sock_kmalloc(sk, fsize+sizeof(*fp), GFP_KERNEL); |