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Json library: fix a number of potential buffer overflows

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This commit is contained in:
Simon Duquennoy 2018-10-15 15:54:11 +02:00
parent 0039fde747
commit 963c2d57aa
2 changed files with 61 additions and 47 deletions
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98
os/lib/json/jsonparse.c
View File

@ -32,34 +32,42 @@
#include "jsonparse.h"
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
/*--------------------------------------------------------------------*/
static int
static bool
push(struct jsonparse_state *state, char c)
{
state->stack[state->depth] = c;
state->depth++;
state->vtype = 0;
return state->depth < JSONPARSE_MAX_DEPTH;
if(state->depth < JSONPARSE_MAX_DEPTH) {
state->stack[state->depth] = c;
state->depth++;
state->vtype = 0;
return true;
} else {
return false;
}
}
/*--------------------------------------------------------------------*/
static void
static bool
modify(struct jsonparse_state *state, char c)
{
if(state->depth > 0) {
state->stack[state->depth - 1] = c;
return true;
} else {
return false;
}
}
/*--------------------------------------------------------------------*/
static char
static bool
pop(struct jsonparse_state *state)
{
if(state->depth == 0) {
return JSON_TYPE_ERROR;
return false;
}
state->depth--;
state->vtype = state->stack[state->depth];
return state->stack[state->depth];
return true;
}
/*--------------------------------------------------------------------*/
/* will pass by the value and store the start and length of the value for
@ -134,15 +142,11 @@ skip_ws(struct jsonparse_state *state)
}
}
/*--------------------------------------------------------------------*/
static int
static bool
is_atomic(struct jsonparse_state *state)
{
char v = state->vtype;
if(v == 'N' || v == '"' || v == '0' || v == 'n' || v == 't' || v == 'f') {
return 1;
} else {
return 0;
}
return v == 'N' || v == '"' || v == '0' || v == 'n' || v == 't' || v == 'f';
}
/*--------------------------------------------------------------------*/
void
@ -163,6 +167,7 @@ jsonparse_next(struct jsonparse_state *state)
char c;
char s;
char v;
bool ret;
skip_ws(state);
c = state->json[state->pos];
@ -173,48 +178,51 @@ jsonparse_next(struct jsonparse_state *state)
switch(c) {
case '{':
if((s == 0 && v == 0) || s == '[' || s == ':') {
push(state, c);
} else {
state->error = JSON_ERROR_UNEXPECTED_OBJECT;
return JSON_TYPE_ERROR;
if(push(state, c)) {
return c;
}
}
return c;
state->error = JSON_ERROR_UNEXPECTED_OBJECT;
return JSON_TYPE_ERROR;
case '}':
if((s == ':' && v != ',' && v != 0 ) || (s == '{' && v == 0)) {
pop(state);
} else {
state->error = JSON_ERROR_UNEXPECTED_END_OF_OBJECT;
return JSON_TYPE_ERROR;
if(pop(state)) {
return c;
}
}
return c;
state->error = JSON_ERROR_UNEXPECTED_END_OF_OBJECT;
return JSON_TYPE_ERROR;
case ']':
if(s == '[' && v != ',') {
pop(state);
} else {
state->error = JSON_ERROR_UNEXPECTED_END_OF_ARRAY;
return JSON_TYPE_ERROR;
if(pop(state)) {
return c;
}
}
return c;
state->error = JSON_ERROR_UNEXPECTED_END_OF_ARRAY;
return JSON_TYPE_ERROR;
case ':':
if(s == '{' && v == 'N') {
modify(state, ':');
ret = modify(state, ':');
state->vtype = 0;
} else {
state->error = JSON_ERROR_SYNTAX;
return JSON_TYPE_ERROR;
if(ret) {
return jsonparse_next(state);
}
}
return jsonparse_next(state);
state->error = JSON_ERROR_SYNTAX;
return JSON_TYPE_ERROR;
case ',':
if(s == ':' && v != 0) {
modify(state, '{');
ret = modify(state, '{');
state->vtype = c;
if(ret) {
return c;
}
} else if(s == '[') {
state->vtype = c;
} else {
state->error = JSON_ERROR_SYNTAX;
return JSON_TYPE_ERROR;
return c;
}
return c;
state->error = JSON_ERROR_SYNTAX;
return JSON_TYPE_ERROR;
case '"':
if((s == 0 && v == 0) || s == '{' || s == '[' || s == ':') {
return atomic(state, c = (s == '{' ? JSON_TYPE_PAIR_NAME : c));
@ -225,12 +233,12 @@ jsonparse_next(struct jsonparse_state *state)
return c;
case '[':
if((s == 0 && v == 0) || s == '[' || s == ':') {
push(state, c);
} else {
state->error = JSON_ERROR_UNEXPECTED_ARRAY;
return JSON_TYPE_ERROR;
if(push(state, c)) {
return c;
}
}
return c;
state->error = JSON_ERROR_UNEXPECTED_ARRAY;
return JSON_TYPE_ERROR;
case 0:
if(v == 0 || state->depth > 0) {
state->error = JSON_ERROR_SYNTAX;

10
os/lib/json/jsontree.c
View File

@ -198,7 +198,10 @@ jsontree_print_next(struct jsontree_context *js_ctx)
} else {
ov = o->values[index];
}
/* TODO check max depth */
if(js_ctx->depth >= JSONTREE_MAX_DEPTH - 1) {
/* Too deep: return 0 */
return 0;
}
js_ctx->depth++; /* step down to value... */
js_ctx->index[js_ctx->depth] = 0; /* and init index */
js_ctx->values[js_ctx->depth] = ov;
@ -299,7 +302,10 @@ find_next(struct jsontree_context *js_ctx)
} else {
ov = o->values[index];
}
/* TODO check max depth */
if(js_ctx->depth >= JSONTREE_MAX_DEPTH - 1) {
/* Too deep: return NULL */
return NULL;
}
js_ctx->depth++; /* step down to value... */
js_ctx->index[js_ctx->depth] = 0; /* and init index */
js_ctx->values[js_ctx->depth] = ov;