amp_assoc_dump() didn't check the length of amp assoc struct.
If there is wrong lengh size of assoc date, amp_assoc_dump() and
amp_dump_chanlist() will read over the size(heap-buffer-overflow).
use t_len to save the length avoid use the wrong size of date.
---
tools/parser/amp.c | 35 +++++++++++++++++++++++++++--------
tools/parser/hci.c | 4 ++--
tools/parser/l2cap.c | 6 ++++--
tools/parser/parser.h | 2 +-
4 files changed, 34 insertions(+), 13 deletions(-)
diff --git a/tools/parser/amp.c b/tools/parser/amp.c
index 7c85fb96c..d3459dfe1 100644
--- a/tools/parser/amp.c
+++ b/tools/parser/amp.c
@@ -28,7 +28,8 @@
#include "parser.h"
#include "lib/amp.h"
-static void amp_dump_chanlist(int level, struct amp_tlv *tlv, char *prefix)
+static void amp_dump_chanlist(int level, struct amp_tlv *tlv,
+ uint16_t t_len, char *prefix)
{
struct amp_chan_list *chan_list = (void *) tlv->val;
struct amp_country_triplet *triplet;
@@ -38,6 +39,12 @@ static void amp_dump_chanlist(int level, struct amp_tlv *tlv, char *prefix)
printf("%s (number of triplets %d)\n", prefix, num);
+ if (btohs(tlv->len) > t_len) {
+ p_indent(level+1, 0);
+ printf("Wrong number of triplets\n");
+ num = (t_len - sizeof(*chan_list)) / sizeof(*triplet);
+ }
+
p_indent(level+2, 0);
printf("Country code: %c%c%c\n", chan_list->country_code[0],
@@ -68,7 +75,7 @@ static void amp_dump_chanlist(int level, struct amp_tlv *tlv, char *prefix)
}
}
-void amp_assoc_dump(int level, uint8_t *assoc, uint16_t len)
+void amp_assoc_dump(int level, uint8_t *assoc, uint16_t len, uint16_t t_len)
{
struct amp_tlv *tlv = (void *) assoc;
@@ -76,6 +83,14 @@ void amp_assoc_dump(int level, uint8_t *assoc, uint16_t len)
printf("Assoc data [len %d]:\n", len);
while (len > sizeof(*tlv)) {
+ if (btohs(tlv->len) > (t_len - sizeof(struct amp_tlv))) {
+ p_indent(level+1, 0);
+ printf("Assoc data get error size\n");
+ t_len -= sizeof(struct amp_tlv);
+ } else {
+ t_len -= sizeof(struct amp_tlv) + btohs(tlv->len);
+ }
+
uint16_t tlvlen = btohs(tlv->len);
struct amp_pal_ver *ver;
@@ -91,11 +106,13 @@ void amp_assoc_dump(int level, uint8_t *assoc, uint16_t len)
break;
case A2MP_PREF_CHANLIST_TYPE:
- amp_dump_chanlist(level, tlv, "Preferred Chan List");
+ amp_dump_chanlist(level, tlv,
+ t_len, "Preferred Chan List");
break;
case A2MP_CONNECTED_CHAN:
- amp_dump_chanlist(level, tlv, "Connected Chan List");
+ amp_dump_chanlist(level, tlv,
+ t_len, "Connected Chan List");
break;
case A2MP_PAL_CAP_TYPE:
@@ -119,9 +136,11 @@ void amp_assoc_dump(int level, uint8_t *assoc, uint16_t len)
printf("Unrecognized type %d\n", tlv->type);
break;
}
-
- len -= tlvlen + sizeof(*tlv);
- assoc += tlvlen + sizeof(*tlv);
- tlv = (struct amp_tlv *) assoc;
+ if (btohs(tlv->len) <= t_len) {
+ len -= tlvlen + sizeof(*tlv);
+ assoc += tlvlen + sizeof(*tlv);
+ tlv = (struct amp_tlv *) assoc;
+ } else
+ len = 0;
}
}
diff --git a/tools/parser/hci.c b/tools/parser/hci.c
index 41f6fe087..424ff4bd7 100644
--- a/tools/parser/hci.c
+++ b/tools/parser/hci.c
@@ -1679,7 +1679,7 @@ static inline void write_remote_amp_assoc_cmd_dump(int level,
printf("handle 0x%2.2x len_so_far %d remaining_len %d\n", cp->handle,
cp->length_so_far, cp->remaining_length);
- amp_assoc_dump(level + 1, cp->fragment, frm->len - 5);
+ amp_assoc_dump(level + 1, cp->fragment, frm->len - 5, frm->len - 5);
}
static inline void command_dump(int level, struct frame *frm)
@@ -2662,7 +2662,7 @@ static inline void read_local_amp_assoc_dump(int level, struct frame *frm)
p_indent(level, frm);
printf("Error: %s\n", status2str(rp->status));
} else {
- amp_assoc_dump(level + 1, rp->fragment, len);
+ amp_assoc_dump(level + 1, rp->fragment, len, frm->len - 4);
}
}
diff --git a/tools/parser/l2cap.c b/tools/parser/l2cap.c
index e43761cf7..58a23a54c 100644
--- a/tools/parser/l2cap.c
+++ b/tools/parser/l2cap.c
@@ -1172,7 +1172,8 @@ static inline void a2mp_assoc_rsp(int level, struct frame *frm, uint16_t len)
printf("Get AMP Assoc rsp: id %d status (%d) %s\n",
h->id, h->status, a2mpstatus2str(h->status));
- amp_assoc_dump(level + 1, h->assoc_data, len - sizeof(*h));
+ amp_assoc_dump(level + 1, h->assoc_data,
+ len - sizeof(*h), frm->len - sizeof(*h));
}
static inline void a2mp_create_req(int level, struct frame *frm, uint16_t len)
@@ -1181,7 +1182,8 @@ static inline void a2mp_create_req(int level, struct frame *frm, uint16_t len)
printf("Create Physical Link req: local id %d remote id %d\n",
h->local_id, h->remote_id);
- amp_assoc_dump(level + 1, h->assoc_data, len - sizeof(*h));
+ amp_assoc_dump(level + 1, h->assoc_data,
+ len - sizeof(*h), frm->len - sizeof(*h));
}
static inline void a2mp_create_rsp(int level, struct frame *frm)
diff --git a/tools/parser/parser.h b/tools/parser/parser.h
index b7e1d7568..97c4bbea1 100644
--- a/tools/parser/parser.h
+++ b/tools/parser/parser.h
@@ -249,7 +249,7 @@ void ericsson_dump(int level, struct frame *frm);
void csr_dump(int level, struct frame *frm);
void bpa_dump(int level, struct frame *frm);
-void amp_assoc_dump(int level, uint8_t *assoc, uint16_t len);
+void amp_assoc_dump(int level, uint8_t *assoc, uint16_t len, uint16_t t_len);
static inline void parse(struct frame *frm)
{
--
2.21.0
