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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 /net | |
| parent | 6732badee0dad467fcc9dd0168af8677b2b1bc2f (diff) | |
| download | linux-1b93ae64cabe5e28dd5a1f35f96f938ca4f6ae20.tar.bz2 | |
[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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/filter.c | 4 |
1 files changed, 2 insertions, 2 deletions
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); |