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lottie: Fix buffer-overflow in base64 decode

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Jinny You 2024-04-01 12:18:51 +09:00 • committed by Hermet Park
parent c503f688db
commit 8bc1daac38
1 changed files with 2 additions and 2 deletions
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4
src/common/tvgCompressor.cpp
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@ -458,11 +458,11 @@ size_t b64Decode(const char* encoded, const size_t len, char** decoded)
auto value2 = B64_INDEX[(size_t)encoded[1]];
output[idx++] = (value1 << 2) + ((value2 & 0x30) >> 4);
if (!encoded[2] || encoded[2] == '=' || encoded[2] == '.') break;
if (!encoded[2] || encoded[3] < 0 || encoded[2] == '=' || encoded[2] == '.') break;
auto value3 = B64_INDEX[(size_t)encoded[2]];
output[idx++] = ((value2 & 0x0f) << 4) + ((value3 & 0x3c) >> 2);
if (!encoded[3] || encoded[3] == '=' || encoded[3] == '.') break;
if (!encoded[3] || encoded[3] < 0 || encoded[3] == '=' || encoded[3] == '.') break;
auto value4 = B64_INDEX[(size_t)encoded[3]];
output[idx++] = ((value3 & 0x03) << 6) + value4;
encoded += 4;