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eap-pwd: fix buffer overflow for larger groups

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The KDF function processes data in 32 byte chunks so for groups which
primes are not divisible by 32 bytes, you will get a buffer overflow
when copying the last chunk of data.

Now l_checksum_get_digest is limited to the bytes remaining in the
buffer, or 32, whichever is the smallest.
This commit is contained in:
James Prestwood 2019-03-18 16:59:37 -07:00 committed by Denis Kenzior
parent 06ee531749
commit a983ca0c33
1 changed files with 1 additions and 1 deletions
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2
src/eap-pwd.c
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@ -117,7 +117,7 @@ static bool kdf(uint8_t *key, size_t key_len, const char *label,
if (!l_checksum_updatev(hmac, iov, iov_pos))
return false;
l_checksum_get_digest(hmac, out + len, 32);
l_checksum_get_digest(hmac, out + len, minsize(olen - len, 32));
l_checksum_free(hmac);
len += 32;