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fix: json depth limit has been changed to 64 (#5036)

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fixed: https://github.com/dragonflydb/dragonfly/issues/5028
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Volodymyr Yavdoshenko 2025-04-30 17:40:03 +03:00 • committed by GitHub
parent 2661fe16b4
commit ae4615b470
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2 changed files with 15 additions and 2 deletions
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9
src/core/json/json_object.cc
View file

@ -18,8 +18,13 @@ optional<JsonType> JsonFromString(string_view input, PMR_NS::memory_resource* mr
return false;
};
// The maximum allowed JSON nesting depth is 256.
const uint32_t json_nesting_depth_limit = 256;
// The maximum allowed JSON nesting depth is 64.
// The limit was reduced from 256 to 64. This change is reasonable, as most documents contain
// no more than 20-30 levels of nesting. In the test case, over 128 levels were used, causing
// the parser to enter a long stall due to excessive resource consumption. Even a limit of 128
// does not mitigate the issue. A limit of 64 is a sensible compromise.
// See https://github.com/dragonflydb/dragonfly/issues/5028
const uint32_t json_nesting_depth_limit = 64;
/* The maximum possible JSON nesting depth is either the specified json_nesting_depth_limit or
half of the input size. Since nesting a JSON object requires at least 2 characters. */

8
src/server/json_family_test.cc
View file

@ -3079,4 +3079,12 @@ TEST_F(JsonFamilyTest, ArrPopWithFormatParameter) {
ASSERT_THAT(resp, ErrArg("value is not an integer or out of range"));
}
TEST_F(JsonFamilyTest, DepthLimitExceeded) {
string deep_json =
R"({"jdiqr":{"nro":{"uzuf":{"bq":{"yc":{"zodmw":{"zbbq":{"sf":{"oule":{"j":{"mjsss":{"tap":{"bh":{"f":{"zlwgu":{"s":{"kt":{"fnmo":{"hub":{"xj":{"jo":{"ofara":{"kx":{"uw":{"z":{"mwvk":{"jo":{"qqz":{"b":{"tbp":{"esx":{"g":{"p":{"tpzk":{"i":{"azq":{"ttcd":{"wl":{"zo":{"l":{"nsq":{"tulso":{"uk":{"imfzw":{"vlub":{"k":{"ypml":{"voack":{"sosd":{"f":{"x":{"usv":{"hnw":{"ax":{"e":{"ozi":{"doi":{"k":{"bz":{"vxhp":{"e":{"vnpv":{"rhs":{"j":{"esp":{"f":{"ykyvy":{"xvmhg":{"eks":{"oijy":{"sjk":{"a":{"sejgy":{"msd":{"acyo":{"yxss":{"slbf":{"ssuns":{"c":{"kv":{"i":{"y":{"ubqz":{"uam":{"igaq":{"jl":{"vy":{"zlu":{"gscx":{"mb":{"idca":{"k":{"twx":{"ngjs":{"k":{"xcx":{"sxc":{"ye":{"fty":{"pho":{"lrn":{"wmv":{"h":{"sfuk":{"ilwzy":{"nlofv":{"mpcms":{"bg":{"jykgm":{"x":{"nbe":{"ixbyh":{"tmus":{"nqulr":{"cqxdw":{"wwpi":{"kj":{"udb":{"oct":{"tqkv":{"r":{"zev":{"rsu":{"gs":{"pyzm":{"au":{"__leaf":42}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}})";
auto resp = Run({"JSON.SET", "test", "$", deep_json});
ASSERT_THAT(resp, ErrArg("ERR failed to parse JSON"));
}
} // namespace dfly