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Zero a cipher completely before freeing it

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We used to only zero the first ptrsize bytes of the cipher. Since
cipher is large enough, we didn't zero too many bytes. Discovered
and fixed by ekir. Fixes bug 1254.
This commit is contained in:
Sebastian Hahn 2010-02-22 11:39:29 +01:00
parent 5e5bc8724e
commit a9802d3322
2 changed files with 7 additions and 1 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
Changes in version 0.2.1.25 - 2010-??-??
o Major bugfixes:
- When freeing a cipher, zero it out completely. We only zeroed
the first ptrsize bytes. Bugfix on tor-0.0.2pre8. Discovered
and patched by ekir. Fixes bug 1254.
Changes in version 0.2.1.24 - 2010-02-21
Tor 0.2.1.24 makes Tor work again on the latest OS X -- this time
for sure!

2
src/common/aes.c
View File

@ -267,7 +267,7 @@ aes_free_cipher(aes_cnt_cipher_t *cipher)
#ifdef USE_OPENSSL_EVP
EVP_CIPHER_CTX_cleanup(&cipher->key);
#endif
memset(cipher, 0, sizeof(cipher));
memset(cipher, 0, sizeof(aes_cnt_cipher_t));
tor_free(cipher);
}