4.9-stable review patch. If anyone has any objections, please let me know.
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From: Florian Westphal fw@strlen.de
[ Upstream commit fc6a5d0601c5ac1d02f283a46f60b87b2033e5ca ]
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 Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/bridge/netfilter/ebtables.c | 27 ++++++++++++++++++--------- 1 file changed, 18 insertions(+), 9 deletions(-)
--- a/net/bridge/netfilter/ebtables.c +++ b/net/bridge/netfilter/ebtables.c @@ -1625,7 +1625,8 @@ static int compat_match_to_user(struct e 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)) @@ -1652,7 +1653,8 @@ static int compat_target_to_user(struct 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)) @@ -1880,7 +1882,8 @@ static int ebt_buf_add(struct ebt_entrie 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);
@@ -1893,7 +1896,8 @@ static int ebt_buf_add_pad(struct ebt_en { 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); @@ -1970,8 +1974,10 @@ static int compat_mtw_from_user(struct c 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; @@ -2021,7 +2027,8 @@ static int ebt_size_mwt(struct compat_eb 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();
@@ -2130,7 +2137,8 @@ static int size_entry_mwt(struct ebt_ent
startoff = state->buf_user_offset - startoff;
- BUG_ON(*total < startoff); + if (WARN_ON(*total < startoff)) + return -EINVAL; *total -= startoff; return 0; } @@ -2257,7 +2265,8 @@ static int compat_do_replace(struct net 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;