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att_db_util: fix realloc of att db buffer for large attributes

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This commit is contained in:
Matthias Ringwald 2020-01-23 14:19:22 +01:00
parent 8d783ab1e6
commit 5c0b28ef04
2 changed files with 14 additions and 6 deletions
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3
CHANGELOG.md
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@ -11,7 +11,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
### Fixed
- L2CAP ERTM: avoid read-after-free on decline of incoming connection
- GATT Client: set uuid16 to zero when deserializing uuid128 services, characteristics, and descriptors
- att_db_util: fix realloc of att db buffer for large attributes
### Added
- att_db_util: provide GATT Database Hash via att_db_util_hash_calc
- GATT Compiler: provide GATT Database Hash via GATT_DATABASE_HASH Characteristic

17
src/ble/att_db_util.c
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@ -48,7 +48,10 @@
#include "bluetooth.h"
// ATT DB Storage
#ifndef HAVE_MALLOC
#ifdef HAVE_MALLOC
// number of bytes that the att db buffer is increased on init / realloc
#define ATT_DB_BUFFER_INCREMENT 128
#else
#ifdef MAX_ATT_DB_SIZE
static uint8_t att_db_storage[MAX_ATT_DB_SIZE];
#else
@ -70,8 +73,8 @@ static void att_db_util_set_end_tag(void){
void att_db_util_init(void){
#ifdef HAVE_MALLOC
att_db = (uint8_t*) malloc(128);
att_db_max_size = 128;
att_db = (uint8_t*) malloc(ATT_DB_BUFFER_INCREMENT);
att_db_max_size = ATT_DB_BUFFER_INCREMENT;
#else
att_db = att_db_storage;
att_db_max_size = sizeof(att_db_storage);
@ -119,9 +122,13 @@ static bool att_db_util_hash_include_without_value(uint16_t uuid16){
*/
static int att_db_util_assert_space(uint16_t size){
size += 2; // for end tag
if ((att_db_size + size) <= att_db_max_size) return 1;
uint16_t required_size = att_db_size + size;
if (required_size <= att_db_max_size) return 1;
#ifdef HAVE_MALLOC
int new_size = att_db_size + att_db_size / 2;
uint16_t new_size = att_db_max_size;
while (new_size < required_size){
new_size += ATT_DB_BUFFER_INCREMENT
}
uint8_t * new_db = (uint8_t*) realloc(att_db, new_size);
if (!new_db) {
log_error("att_db: realloc failed");