diff options
| author | Phil Sutter <phil@nwl.cc> | 2020-01-20 14:48:26 +0100 |
|---|---|---|
| committer | Phil Sutter <phil@nwl.cc> | 2020-01-22 09:01:01 +0100 |
| commit | e957bd9f10d5e36671a0b0398e2037fc6201275b (patch) | |
| tree | 87c9edef1c3d3bc8e3474508265e0bead92bba23 /src/netlink_delinearize.c | |
| parent | c3f6be3f2dcedf6d79751c0b975315ebc3184364 (diff) | |
netlink: Fix leaks in netlink_parse_cmp()
This fixes several problems at once:
* Err path would leak expr 'right' in two places and 'left' in one.
* Concat case would leak 'right' by overwriting the pointer. Introduce a
temporary variable to hold the new pointer.
Fixes: 6377380bc265f ("netlink_delinearize: handle relational and lookup concat expressions")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'src/netlink_delinearize.c')
| -rw-r--r-- | src/netlink_delinearize.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/src/netlink_delinearize.c b/src/netlink_delinearize.c index 06a0312b..88dbd5a8 100644 --- a/src/netlink_delinearize.c +++ b/src/netlink_delinearize.c @@ -274,7 +274,7 @@ static void netlink_parse_cmp(struct netlink_parse_ctx *ctx, { struct nft_data_delinearize nld; enum nft_registers sreg; - struct expr *expr, *left, *right; + struct expr *expr, *left, *right, *tmp; enum ops op; sreg = netlink_parse_register(nle, NFTNL_EXPR_CMP_SREG); @@ -291,19 +291,26 @@ static void netlink_parse_cmp(struct netlink_parse_ctx *ctx, if (left->len > right->len && expr_basetype(left) != &string_type) { - return netlink_error(ctx, loc, "Relational expression size mismatch"); + netlink_error(ctx, loc, "Relational expression size mismatch"); + goto err_free; } else if (left->len > 0 && left->len < right->len) { expr_free(left); left = netlink_parse_concat_expr(ctx, loc, sreg, right->len); if (left == NULL) - return; - right = netlink_parse_concat_data(ctx, loc, sreg, right->len, right); - if (right == NULL) - return; + goto err_free; + tmp = netlink_parse_concat_data(ctx, loc, sreg, right->len, right); + if (tmp == NULL) + goto err_free; + expr_free(right); + right = tmp; } expr = relational_expr_alloc(loc, op, left, right); ctx->stmt = expr_stmt_alloc(loc, expr); + return; +err_free: + expr_free(left); + expr_free(right); } static void netlink_parse_lookup(struct netlink_parse_ctx *ctx, |