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| author | Andrey Ryabinin <aryabinin@virtuozzo.com> | 2016-11-24 13:23:03 +0000 |
|---|---|---|
| committer | James Morris <james.l.morris@oracle.com> | 2016-11-25 12:57:48 +1100 |
| commit | 2b95fda2c4fcb6d6625963f889247538f247fce0 (patch) | |
| tree | 9382af67b6bc117766e0ebc8efc0e6f85e43ee53 /crypto/asymmetric_keys | |
| parent | 16ae16c6e5616c084168740990fc508bda6655d4 (diff) | |
| download | lwn-2b95fda2c4fcb6d6625963f889247538f247fce0.tar.gz lwn-2b95fda2c4fcb6d6625963f889247538f247fce0.zip | |
X.509: Fix double free in x509_cert_parse() [ver #3]
We shouldn't free cert->pub->key in x509_cert_parse() because
x509_free_certificate() also does this:
BUG: Double free or freeing an invalid pointer
...
Call Trace:
[<ffffffff81896c20>] dump_stack+0x63/0x83
[<ffffffff81356571>] kasan_object_err+0x21/0x70
[<ffffffff81356ed9>] kasan_report_double_free+0x49/0x60
[<ffffffff813561ad>] kasan_slab_free+0x9d/0xc0
[<ffffffff81350b7a>] kfree+0x8a/0x1a0
[<ffffffff81844fbf>] public_key_free+0x1f/0x30
[<ffffffff818455d4>] x509_free_certificate+0x24/0x90
[<ffffffff818460bc>] x509_cert_parse+0x2bc/0x300
[<ffffffff81846cae>] x509_key_preparse+0x3e/0x330
[<ffffffff818444cf>] asymmetric_key_preparse+0x6f/0x100
[<ffffffff8178bec0>] key_create_or_update+0x260/0x5f0
[<ffffffff8178e6d9>] SyS_add_key+0x199/0x2a0
[<ffffffff821d823b>] entry_SYSCALL_64_fastpath+0x1e/0xad
Object at ffff880110bd1900, in cache kmalloc-512 size: 512
....
Freed:
PID = 2579
[<ffffffff8104283b>] save_stack_trace+0x1b/0x20
[<ffffffff813558f6>] save_stack+0x46/0xd0
[<ffffffff81356183>] kasan_slab_free+0x73/0xc0
[<ffffffff81350b7a>] kfree+0x8a/0x1a0
[<ffffffff818460a3>] x509_cert_parse+0x2a3/0x300
[<ffffffff81846cae>] x509_key_preparse+0x3e/0x330
[<ffffffff818444cf>] asymmetric_key_preparse+0x6f/0x100
[<ffffffff8178bec0>] key_create_or_update+0x260/0x5f0
[<ffffffff8178e6d9>] SyS_add_key+0x199/0x2a0
[<ffffffff821d823b>] entry_SYSCALL_64_fastpath+0x1e/0xad
Fixes: db6c43bd2132 ("crypto: KEYS: convert public key and digsig asym to the akcipher api")
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
Diffstat (limited to 'crypto/asymmetric_keys')
| -rw-r--r-- | crypto/asymmetric_keys/x509_cert_parser.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/crypto/asymmetric_keys/x509_cert_parser.c b/crypto/asymmetric_keys/x509_cert_parser.c index 865f46ea724f..c80765b211cf 100644 --- a/crypto/asymmetric_keys/x509_cert_parser.c +++ b/crypto/asymmetric_keys/x509_cert_parser.c @@ -133,7 +133,6 @@ struct x509_certificate *x509_cert_parse(const void *data, size_t datalen) return cert; error_decode: - kfree(cert->pub->key); kfree(ctx); error_no_ctx: x509_free_certificate(cert); |