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netfilter: ebtables: convert BUG_ONs to WARN_ONs

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All of these conditions are not fatal and should have
been WARN_ONs from the get-go.

Convert them to WARN_ONs and bail out.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2018-02-19 01:24:53 +01:00 committed by Pablo Neira Ayuso
parent c4585a2823
commit fc6a5d0601
1 changed files with 18 additions and 9 deletions
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27
net/bridge/netfilter/ebtables.c
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@ -1641,7 +1641,8 @@ static int compat_match_to_user(struct ebt_entry_match *m, void __user **dstptr,
int off = ebt_compat_match_offset(match, m->match_size);
compat_uint_t msize = m->match_size - off;
BUG_ON(off >= m->match_size);
if (WARN_ON(off >= m->match_size))
return -EINVAL;
if (copy_to_user(cm->u.name, match->name,
strlen(match->name) + 1) || put_user(msize, &cm->match_size))
@ -1671,7 +1672,8 @@ static int compat_target_to_user(struct ebt_entry_target *t,
int off = xt_compat_target_offset(target);
compat_uint_t tsize = t->target_size - off;
BUG_ON(off >= t->target_size);
if (WARN_ON(off >= t->target_size))
return -EINVAL;
if (copy_to_user(cm->u.name, target->name,
strlen(target->name) + 1) || put_user(tsize, &cm->match_size))
@ -1902,7 +1904,8 @@ static int ebt_buf_add(struct ebt_entries_buf_state *state,
if (state->buf_kern_start == NULL)
goto count_only;
BUG_ON(state->buf_kern_offset + sz > state->buf_kern_len);
if (WARN_ON(state->buf_kern_offset + sz > state->buf_kern_len))
return -EINVAL;
memcpy(state->buf_kern_start + state->buf_kern_offset, data, sz);
@ -1915,7 +1918,8 @@ static int ebt_buf_add_pad(struct ebt_entries_buf_state *state, unsigned int sz)
{
char *b = state->buf_kern_start;
BUG_ON(b && state->buf_kern_offset > state->buf_kern_len);
if (WARN_ON(b && state->buf_kern_offset > state->buf_kern_len))
return -EINVAL;
if (b != NULL && sz > 0)
memset(b + state->buf_kern_offset, 0, sz);
@ -1992,8 +1996,10 @@ static int compat_mtw_from_user(struct compat_ebt_entry_mwt *mwt,
pad = XT_ALIGN(size_kern) - size_kern;
if (pad > 0 && dst) {
BUG_ON(state->buf_kern_len <= pad);
BUG_ON(state->buf_kern_offset - (match_size + off) + size_kern > state->buf_kern_len - pad);
if (WARN_ON(state->buf_kern_len <= pad))
return -EINVAL;
if (WARN_ON(state->buf_kern_offset - (match_size + off) + size_kern > state->buf_kern_len - pad))
return -EINVAL;
memset(dst + size_kern, 0, pad);
}
return off + match_size;
@ -2043,7 +2049,8 @@ static int ebt_size_mwt(struct compat_ebt_entry_mwt *match32,
if (ret < 0)
return ret;
BUG_ON(ret < match32->match_size);
if (WARN_ON(ret < match32->match_size))
return -EINVAL;
growth += ret - match32->match_size;
growth += ebt_compat_entry_padsize();
@ -2140,7 +2147,8 @@ static int size_entry_mwt(struct ebt_entry *entry, const unsigned char *base,
startoff = state->buf_user_offset - startoff;
BUG_ON(*total < startoff);
if (WARN_ON(*total < startoff))
return -EINVAL;
*total -= startoff;
return 0;
}
@ -2267,7 +2275,8 @@ static int compat_do_replace(struct net *net, void __user *user,
state.buf_kern_len = size64;
ret = compat_copy_entries(entries_tmp, tmp.entries_size, &state);
BUG_ON(ret < 0); /* parses same data again */
if (WARN_ON(ret < 0))
goto out_unlock;
vfree(entries_tmp);
tmp.entries_size = size64;