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| author | Petri Lehtinen <petri@digip.org> | 2016-05-03 13:07:46 +0300 |
|---|---|---|
| committer | Petri Lehtinen <petri@digip.org> | 2016-05-03 13:07:46 +0300 |
| commit | 013c3892c3b7c39516507838ababb4e9167cc65c (patch) | |
| tree | c62094087ae441d6cb94cb20a3e2376dcdbaaf31 | |
| parent | 087ed94c452ecade26447c14605cd419e970cfd2 (diff) | |
| parent | 64ce0ad3731ebd77e02897b07920eadd0e2cc318 (diff) | |
| download | jansson-013c3892c3b7c39516507838ababb4e9167cc65c.zip jansson-013c3892c3b7c39516507838ababb4e9167cc65c.tar.gz jansson-013c3892c3b7c39516507838ababb4e9167cc65c.tar.bz2 | |
Merge pull request #284 from dev-zzo/issue-282
Don't crash on deeply nested values by limiting parser recursion depth
| -rw-r--r-- | android/jansson_config.h | 4 | ||||
| -rw-r--r-- | cmake/jansson_config.h.cmake | 4 | ||||
| -rw-r--r-- | doc/conformance.rst | 10 | ||||
| -rw-r--r-- | src/jansson_config.h.in | 4 | ||||
| -rw-r--r-- | src/load.c | 10 | ||||
| -rw-r--r-- | test/suites/invalid/recursion-depth/error | 2 | ||||
| -rw-r--r-- | test/suites/invalid/recursion-depth/input | 1 |
7 files changed, 35 insertions, 0 deletions
diff --git a/android/jansson_config.h b/android/jansson_config.h index 0a313a0..689f7ed 100644 --- a/android/jansson_config.h +++ b/android/jansson_config.h @@ -36,4 +36,8 @@ otherwise to 0. */ #define JSON_HAVE_LOCALECONV 0 +/* Maximum recursion depth for parsing JSON input. + This limits the depth of e.g. array-within-array constructions. */ +#define JSON_PARSER_MAX_DEPTH 2048 + #endif diff --git a/cmake/jansson_config.h.cmake b/cmake/jansson_config.h.cmake index 43e36c5..4a32148 100644 --- a/cmake/jansson_config.h.cmake +++ b/cmake/jansson_config.h.cmake @@ -60,5 +60,9 @@ #define JSON_HAVE_LOCALECONV @JSON_HAVE_LOCALECONV@ +/* Maximum recursion depth for parsing JSON input. + This limits the depth of e.g. array-within-array constructions. */ +#define JSON_PARSER_MAX_DEPTH 2048 + #endif diff --git a/doc/conformance.rst b/doc/conformance.rst index de3947d..ea41d5c 100644 --- a/doc/conformance.rst +++ b/doc/conformance.rst @@ -108,3 +108,13 @@ types, ``long double``, etc. Obviously, shorter types like ``short``, are implicitly handled via the ordinary C type coercion rules (subject to overflow semantics). Also, no support or hooks are provided for any supplemental "bignum" type add-on packages. + +Depth of nested values +---------------------- + +To avoid stack exhaustion, Jansson currently limits the nesting depth +for arrays and objects to a certain value (default: 2048), defined as +a macro ``JSON_PARSER_MAX_DEPTH`` within ``jansson_config.h``. + +The limit is allowed to be set by the RFC; there is no recommended value +or required minimum depth to be supported. diff --git a/src/jansson_config.h.in b/src/jansson_config.h.in index 12580a0..aa02160 100644 --- a/src/jansson_config.h.in +++ b/src/jansson_config.h.in @@ -36,4 +36,8 @@ otherwise to 0. */ #define JSON_HAVE_LOCALECONV @json_have_localeconv@ +/* Maximum recursion depth for parsing JSON input. + This limits the depth of e.g. array-within-array constructions. */ +#define JSON_PARSER_MAX_DEPTH 2048 + #endif @@ -62,6 +62,7 @@ typedef struct { stream_t stream; strbuffer_t saved_text; size_t flags; + size_t depth; int token; union { struct { @@ -803,6 +804,12 @@ static json_t *parse_value(lex_t *lex, size_t flags, json_error_t *error) { json_t *json; + lex->depth++; + if(lex->depth > JSON_PARSER_MAX_DEPTH) { + error_set(error, lex, "maximum parsing depth reached"); + return NULL; + } + switch(lex->token) { case TOKEN_STRING: { const char *value = lex->value.string.val; @@ -865,6 +872,7 @@ static json_t *parse_value(lex_t *lex, size_t flags, json_error_t *error) if(!json) return NULL; + lex->depth--; return json; } @@ -872,6 +880,8 @@ static json_t *parse_json(lex_t *lex, size_t flags, json_error_t *error) { json_t *result; + lex->depth = 0; + lex_scan(lex, error); if(!(flags & JSON_DECODE_ANY)) { if(lex->token != '[' && lex->token != '{') { diff --git a/test/suites/invalid/recursion-depth/error b/test/suites/invalid/recursion-depth/error new file mode 100644 index 0000000..11e0537 --- /dev/null +++ b/test/suites/invalid/recursion-depth/error @@ -0,0 +1,2 @@ +1 2049 2049 +maximum parsing depth reached near '[' diff --git a/test/suites/invalid/recursion-depth/input b/test/suites/invalid/recursion-depth/input new file mode 100644 index 0000000..bfa47d9 --- /dev/null +++ b/test/suites/invalid/recursion-depth/input @@ -0,0 +1 @@ +[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[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