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Message-Id: <20171213184520.8193-4-pablo@netfilter.org>
Date: Wed, 13 Dec 2017 19:45:11 +0100
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 03/12] netfilter: nf_ct_h323: Convert CHECK_BOUND macro to function
From: Eric Sesterhenn <eric.sesterhenn@...-dsec.de>
It is bad practive to return in a macro, this patch
moves the check into a function.
Signed-off-by: Eric Sesterhenn <eric.sesterhenn@...-dsec.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
net/netfilter/nf_conntrack_h323_asn1.c | 94 +++++++++++++++++++++++-----------
1 file changed, 65 insertions(+), 29 deletions(-)
diff --git a/net/netfilter/nf_conntrack_h323_asn1.c b/net/netfilter/nf_conntrack_h323_asn1.c
index cf1bf2605c10..3d9a009ac147 100644
--- a/net/netfilter/nf_conntrack_h323_asn1.c
+++ b/net/netfilter/nf_conntrack_h323_asn1.c
@@ -103,7 +103,6 @@ struct bitstr {
#define INC_BIT(bs) if((++(bs)->bit)>7){(bs)->cur++;(bs)->bit=0;}
#define INC_BITS(bs,b) if(((bs)->bit+=(b))>7){(bs)->cur+=(bs)->bit>>3;(bs)->bit&=7;}
#define BYTE_ALIGN(bs) if((bs)->bit){(bs)->cur++;(bs)->bit=0;}
-#define CHECK_BOUND(bs,n) if((bs)->cur+(n)>(bs)->end)return(H323_ERROR_BOUND)
static unsigned int get_len(struct bitstr *bs);
static unsigned int get_bit(struct bitstr *bs);
static unsigned int get_bits(struct bitstr *bs, unsigned int b);
@@ -165,6 +164,14 @@ static unsigned int get_len(struct bitstr *bs)
return v;
}
+static int nf_h323_error_boundary(struct bitstr *bs, size_t bytes)
+{
+ if (*bs->cur + bytes > *bs->end)
+ return 1;
+
+ return 0;
+}
+
/****************************************************************************/
static unsigned int get_bit(struct bitstr *bs)
{
@@ -280,7 +287,8 @@ static int decode_bool(struct bitstr *bs, const struct field_t *f,
INC_BIT(bs);
- CHECK_BOUND(bs, 0);
+ if (nf_h323_error_boundary(bs, 0))
+ return H323_ERROR_BOUND;
return H323_ERROR_NONE;
}
@@ -293,11 +301,14 @@ static int decode_oid(struct bitstr *bs, const struct field_t *f,
PRINT("%*.s%s\n", level * TAB_SIZE, " ", f->name);
BYTE_ALIGN(bs);
- CHECK_BOUND(bs, 1);
+ if (nf_h323_error_boundary(bs, 1))
+ return H323_ERROR_BOUND;
+
len = *bs->cur++;
bs->cur += len;
+ if (nf_h323_error_boundary(bs, 0))
+ return H323_ERROR_BOUND;
- CHECK_BOUND(bs, 0);
return H323_ERROR_NONE;
}
@@ -330,7 +341,8 @@ static int decode_int(struct bitstr *bs, const struct field_t *f,
break;
case UNCO:
BYTE_ALIGN(bs);
- CHECK_BOUND(bs, 2);
+ if (nf_h323_error_boundary(bs, 2))
+ return H323_ERROR_BOUND;
len = get_len(bs);
bs->cur += len;
break;
@@ -341,7 +353,8 @@ static int decode_int(struct bitstr *bs, const struct field_t *f,
PRINT("\n");
- CHECK_BOUND(bs, 0);
+ if (nf_h323_error_boundary(bs, 0))
+ return H323_ERROR_BOUND;
return H323_ERROR_NONE;
}
@@ -357,7 +370,8 @@ static int decode_enum(struct bitstr *bs, const struct field_t *f,
INC_BITS(bs, f->sz);
}
- CHECK_BOUND(bs, 0);
+ if (nf_h323_error_boundary(bs, 0))
+ return H323_ERROR_BOUND;
return H323_ERROR_NONE;
}
@@ -375,12 +389,14 @@ static int decode_bitstr(struct bitstr *bs, const struct field_t *f,
len = f->lb;
break;
case WORD: /* 2-byte length */
- CHECK_BOUND(bs, 2);
+ if (nf_h323_error_boundary(bs, 2))
+ return H323_ERROR_BOUND;
len = (*bs->cur++) << 8;
len += (*bs->cur++) + f->lb;
break;
case SEMI:
- CHECK_BOUND(bs, 2);
+ if (nf_h323_error_boundary(bs, 2))
+ return H323_ERROR_BOUND;
len = get_len(bs);
break;
default:
@@ -391,7 +407,8 @@ static int decode_bitstr(struct bitstr *bs, const struct field_t *f,
bs->cur += len >> 3;
bs->bit = len & 7;
- CHECK_BOUND(bs, 0);
+ if (nf_h323_error_boundary(bs, 0))
+ return H323_ERROR_BOUND;
return H323_ERROR_NONE;
}
@@ -409,7 +426,8 @@ static int decode_numstr(struct bitstr *bs, const struct field_t *f,
BYTE_ALIGN(bs);
INC_BITS(bs, (len << 2));
- CHECK_BOUND(bs, 0);
+ if (nf_h323_error_boundary(bs, 0))
+ return H323_ERROR_BOUND;
return H323_ERROR_NONE;
}
@@ -440,12 +458,14 @@ static int decode_octstr(struct bitstr *bs, const struct field_t *f,
break;
case BYTE: /* Range == 256 */
BYTE_ALIGN(bs);
- CHECK_BOUND(bs, 1);
+ if (nf_h323_error_boundary(bs, 1))
+ return H323_ERROR_BOUND;
len = (*bs->cur++) + f->lb;
break;
case SEMI:
BYTE_ALIGN(bs);
- CHECK_BOUND(bs, 2);
+ if (nf_h323_error_boundary(bs, 2))
+ return H323_ERROR_BOUND;
len = get_len(bs) + f->lb;
break;
default: /* 2 <= Range <= 255 */
@@ -458,7 +478,8 @@ static int decode_octstr(struct bitstr *bs, const struct field_t *f,
PRINT("\n");
- CHECK_BOUND(bs, 0);
+ if (nf_h323_error_boundary(bs, 0))
+ return H323_ERROR_BOUND;
return H323_ERROR_NONE;
}
@@ -473,7 +494,8 @@ static int decode_bmpstr(struct bitstr *bs, const struct field_t *f,
switch (f->sz) {
case BYTE: /* Range == 256 */
BYTE_ALIGN(bs);
- CHECK_BOUND(bs, 1);
+ if (nf_h323_error_boundary(bs, 1))
+ return H323_ERROR_BOUND;
len = (*bs->cur++) + f->lb;
break;
default: /* 2 <= Range <= 255 */
@@ -484,7 +506,8 @@ static int decode_bmpstr(struct bitstr *bs, const struct field_t *f,
bs->cur += len << 1;
- CHECK_BOUND(bs, 0);
+ if (nf_h323_error_boundary(bs, 0))
+ return H323_ERROR_BOUND;
return H323_ERROR_NONE;
}
@@ -525,9 +548,11 @@ static int decode_seq(struct bitstr *bs, const struct field_t *f,
/* Decode */
if (son->attr & OPEN) { /* Open field */
- CHECK_BOUND(bs, 2);
+ if (nf_h323_error_boundary(bs, 2))
+ return H323_ERROR_BOUND;
len = get_len(bs);
- CHECK_BOUND(bs, len);
+ if (nf_h323_error_boundary(bs, len))
+ return H323_ERROR_BOUND;
if (!base || !(son->attr & DECODE)) {
PRINT("%*.s%s\n", (level + 1) * TAB_SIZE,
" ", son->name);
@@ -556,7 +581,8 @@ static int decode_seq(struct bitstr *bs, const struct field_t *f,
/* Get the extension bitmap */
bmp2_len = get_bits(bs, 7) + 1;
- CHECK_BOUND(bs, (bmp2_len + 7) >> 3);
+ if (nf_h323_error_boundary(bs, (bmp2_len + 7) >> 3))
+ return H323_ERROR_BOUND;
bmp2 = get_bitmap(bs, bmp2_len);
bmp |= bmp2 >> f->sz;
if (base)
@@ -567,9 +593,11 @@ static int decode_seq(struct bitstr *bs, const struct field_t *f,
for (opt = 0; opt < bmp2_len; opt++, i++, son++) {
/* Check Range */
if (i >= f->ub) { /* Newer Version? */
- CHECK_BOUND(bs, 2);
+ if (nf_h323_error_boundary(bs, 2))
+ return H323_ERROR_BOUND;
len = get_len(bs);
- CHECK_BOUND(bs, len);
+ if (nf_h323_error_boundary(bs, len))
+ return H323_ERROR_BOUND;
bs->cur += len;
continue;
}
@@ -583,9 +611,11 @@ static int decode_seq(struct bitstr *bs, const struct field_t *f,
if (!((0x80000000 >> opt) & bmp2)) /* Not present */
continue;
- CHECK_BOUND(bs, 2);
+ if (nf_h323_error_boundary(bs, 2))
+ return H323_ERROR_BOUND;
len = get_len(bs);
- CHECK_BOUND(bs, len);
+ if (nf_h323_error_boundary(bs, len))
+ return H323_ERROR_BOUND;
if (!base || !(son->attr & DECODE)) {
PRINT("%*.s%s\n", (level + 1) * TAB_SIZE, " ",
son->name);
@@ -623,19 +653,22 @@ static int decode_seqof(struct bitstr *bs, const struct field_t *f,
switch (f->sz) {
case BYTE:
BYTE_ALIGN(bs);
- CHECK_BOUND(bs, 1);
+ if (nf_h323_error_boundary(bs, 1))
+ return H323_ERROR_BOUND;
count = *bs->cur++;
break;
case WORD:
BYTE_ALIGN(bs);
- CHECK_BOUND(bs, 2);
+ if (nf_h323_error_boundary(bs, 2))
+ return H323_ERROR_BOUND;
count = *bs->cur++;
count <<= 8;
count += *bs->cur++;
break;
case SEMI:
BYTE_ALIGN(bs);
- CHECK_BOUND(bs, 2);
+ if (nf_h323_error_boundary(bs, 2))
+ return H323_ERROR_BOUND;
count = get_len(bs);
break;
default:
@@ -659,7 +692,8 @@ static int decode_seqof(struct bitstr *bs, const struct field_t *f,
if (son->attr & OPEN) {
BYTE_ALIGN(bs);
len = get_len(bs);
- CHECK_BOUND(bs, len);
+ if (nf_h323_error_boundary(bs, len))
+ return H323_ERROR_BOUND;
if (!base || !(son->attr & DECODE)) {
PRINT("%*.s%s\n", (level + 1) * TAB_SIZE,
" ", son->name);
@@ -728,7 +762,8 @@ static int decode_choice(struct bitstr *bs, const struct field_t *f,
if (type >= f->ub) { /* Newer version? */
BYTE_ALIGN(bs);
len = get_len(bs);
- CHECK_BOUND(bs, len);
+ if (nf_h323_error_boundary(bs, len))
+ return H323_ERROR_BOUND;
bs->cur += len;
return H323_ERROR_NONE;
}
@@ -743,7 +778,8 @@ static int decode_choice(struct bitstr *bs, const struct field_t *f,
if (ext || (son->attr & OPEN)) {
BYTE_ALIGN(bs);
len = get_len(bs);
- CHECK_BOUND(bs, len);
+ if (nf_h323_error_boundary(bs, len))
+ return H323_ERROR_BOUND;
if (!base || !(son->attr & DECODE)) {
PRINT("%*.s%s\n", (level + 1) * TAB_SIZE, " ",
son->name);
--
2.11.0
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