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base64_decode check dummies count for safety

master
YuQing 2026-01-22 09:11:23 +08:00
parent 128e04b2ec
commit 82f66af3e2
1 changed files with 14 additions and 9 deletions
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23
src/base64.c
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@ -297,9 +297,7 @@ char *base64_decode_auto(struct base64_context *context, const char *src, \
memcpy(pBuff, src, nSrcLen); memcpy(pBuff, src, nSrcLen);
memset(pBuff + nSrcLen, context->pad_ch, nPadLen); memset(pBuff + nSrcLen, context->pad_ch, nPadLen);
base64_decode(context, pBuff, nNewLen, dest, dest_len); base64_decode(context, pBuff, nNewLen, dest, dest_len);
if (pBuff != tmpBuff) if (pBuff != tmpBuff)
{ {
free(pBuff); free(pBuff);
@ -385,16 +383,23 @@ char *base64_decode(struct base64_context *context, const char *src, \
if (cycle != 0) if (cycle != 0)
{ {
*dest = '\0'; *dest = '\0';
*dest_len = 0; *dest_len = 0;
fprintf(stderr, "Input to decode not an even multiple of " \ fprintf(stderr, "Input to decode not an even multiple of "
"4 characters; pad with %c\n", context->pad_ch); "4 characters; pad with %c\n", context->pad_ch);
return dest; return dest;
}
if (dummies > 2)
{
*dest = '\0';
*dest_len = 0;
fprintf(stderr, "pad char: %c count %d exceeds 2\n",
context->pad_ch, dummies);
return dest;
} }
*dest_len = (pDest - dest) - dummies; *dest_len = (pDest - dest) - dummies;
*(dest + (*dest_len)) = '\0'; *(dest + (*dest_len)) = '\0';
return dest; return dest;
} }