Date: Mon, 15 Sep 2025 22:09:51 GMT From: Alex Richardson <arichardson@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 969be39fb3ca - main - if_ovpn.c: fix use of uninitialized variable Message-ID: <202509152209.58FM9ptY077701@gitrepo.freebsd.org>
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The branch main has been updated by arichardson: URL: https://cgit.FreeBSD.org/src/commit/?id=969be39fb3caf4272f128dbf3267ceba5966a6ce commit 969be39fb3caf4272f128dbf3267ceba5966a6ce Author: Alex Richardson <arichardson@FreeBSD.org> AuthorDate: 2025-09-15 22:08:43 +0000 Commit: Alex Richardson <arichardson@FreeBSD.org> CommitDate: 2025-09-15 22:08:44 +0000 if_ovpn.c: fix use of uninitialized variable In case we use OVPN_CIPHER_ALG_NONE, the memcpy will attempt to copy 0 bytes from an uninitialized pointer. While the memcpy() implementation will treat this as a no-op and not actually dereferece the undefined variable it is still undefined behaviour to the compiler and should be fixed. Found by building with clang HEAD Reviewed by: kp MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D52543 --- sys/net/if_ovpn.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/sys/net/if_ovpn.c b/sys/net/if_ovpn.c index fe015632f33e..1c18baac3417 100644 --- a/sys/net/if_ovpn.c +++ b/sys/net/if_ovpn.c @@ -904,9 +904,11 @@ ovpn_create_kkey_dir(struct ovpn_kkey_dir **kdirp, kdir->cipher = cipher; kdir->keylen = keylen; kdir->tx_seq = 1; - memcpy(kdir->key, key, keylen); + if (keylen != 0) + memcpy(kdir->key, key, keylen); kdir->noncelen = ivlen; - memcpy(kdir->nonce, iv, ivlen); + if (ivlen != 0) + memcpy(kdir->nonce, iv, ivlen); if (kdir->cipher != OVPN_CIPHER_ALG_NONE) { /* Crypto init */
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