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| author | Arnd Bergmann <arnd@arndb.de> | 2016-10-18 00:05:30 +0200 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2016-10-18 17:35:10 +0200 |
| commit | d2e4d593516e877f1f6fb40031eb495f36606e16 (patch) | |
| tree | 88546004cba7605b074ab6b93e85b917dfb69976 /net | |
| parent | ccca6607c545534e5b74ef04e0f2f6ba11344be4 (diff) | |
| download | linux-d2e4d593516e877f1f6fb40031eb495f36606e16.tar.gz linux-d2e4d593516e877f1f6fb40031eb495f36606e16.tar.bz2 linux-d2e4d593516e877f1f6fb40031eb495f36606e16.zip | |
netfilter: nf_tables: avoid uninitialized variable warning
The newly added nft_range_eval() function handles the two possible
nft range operations, but as the compiler warning points out,
any unexpected value would lead to the 'mismatch' variable being
used without being initialized:
net/netfilter/nft_range.c: In function 'nft_range_eval':
net/netfilter/nft_range.c:45:5: error: 'mismatch' may be used uninitialized in this function [-Werror=maybe-uninitialized]
This removes the variable in question and instead moves the
condition into the switch itself, which is potentially more
efficient than adding a bogus 'default' clause as in my
first approach, and is nicer than using the 'uninitialized_var'
macro.
Fixes: 0f3cd9b36977 ("netfilter: nf_tables: add range expression")
Link: http://patchwork.ozlabs.org/patch/677114/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netfilter/nft_range.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/net/netfilter/nft_range.c b/net/netfilter/nft_range.c index 9bc4586c3006..fbc88009ca2e 100644 --- a/net/netfilter/nft_range.c +++ b/net/netfilter/nft_range.c @@ -28,22 +28,20 @@ static void nft_range_eval(const struct nft_expr *expr, const struct nft_pktinfo *pkt) { const struct nft_range_expr *priv = nft_expr_priv(expr); - bool mismatch; int d1, d2; d1 = memcmp(®s->data[priv->sreg], &priv->data_from, priv->len); d2 = memcmp(®s->data[priv->sreg], &priv->data_to, priv->len); switch (priv->op) { case NFT_RANGE_EQ: - mismatch = (d1 < 0 || d2 > 0); + if (d1 < 0 || d2 > 0) + regs->verdict.code = NFT_BREAK; break; case NFT_RANGE_NEQ: - mismatch = (d1 >= 0 && d2 <= 0); + if (d1 >= 0 && d2 <= 0) + regs->verdict.code = NFT_BREAK; break; } - - if (mismatch) - regs->verdict.code = NFT_BREAK; } static const struct nla_policy nft_range_policy[NFTA_RANGE_MAX + 1] = { |