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QR-Code-generator
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Fixed integer overflow checks in C code.

This commit is contained in:
Project Nayuki 2017-04-20 04:10:53 +00:00
parent 31634fc05c
commit 21212ba617
1 changed files with 2 additions and 2 deletions
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4
c/qrcodegen.c
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@ -113,14 +113,14 @@ int qrcodegen_encodeText(const char *text, uint8_t tempBuffer[], uint8_t qrcode[
if (textLen > INT_MAX / 3)
return 0;
textBits = textLen * 3;
if (textLen > INT_MAX - 2 || textLen > INT_MAX - textBits)
if (textLen > INT_MAX - 2 || (textLen + 2) / 3 > INT_MAX - textBits)
return 0;
textBits += (textLen + 2) / 3;
} else if (isAlphanumeric) { // textBits = textLen * 5 + ceil(textLen / 2)
if (textLen > INT_MAX / 5)
return 0;
textBits = textLen * 5;
if (textLen > INT_MAX - 1 || textLen > INT_MAX - textBits)
if (textLen > INT_MAX - 1 || (textLen + 1) / 2 > INT_MAX - textBits)
return 0;
textBits += (textLen + 1) / 2;
} else { // Use binary mode