From 2b95fda2c4fcb6d6625963f889247538f247fce0 Mon Sep 17 00:00:00 2001 From: Andrey Ryabinin Date: Thu, 24 Nov 2016 13:23:03 +0000 Subject: [PATCH] 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: [] dump_stack+0x63/0x83 [] kasan_object_err+0x21/0x70 [] kasan_report_double_free+0x49/0x60 [] kasan_slab_free+0x9d/0xc0 [] kfree+0x8a/0x1a0 [] public_key_free+0x1f/0x30 [] x509_free_certificate+0x24/0x90 [] x509_cert_parse+0x2bc/0x300 [] x509_key_preparse+0x3e/0x330 [] asymmetric_key_preparse+0x6f/0x100 [] key_create_or_update+0x260/0x5f0 [] SyS_add_key+0x199/0x2a0 [] entry_SYSCALL_64_fastpath+0x1e/0xad Object at ffff880110bd1900, in cache kmalloc-512 size: 512 .... Freed: PID = 2579 [] save_stack_trace+0x1b/0x20 [] save_stack+0x46/0xd0 [] kasan_slab_free+0x73/0xc0 [] kfree+0x8a/0x1a0 [] x509_cert_parse+0x2a3/0x300 [] x509_key_preparse+0x3e/0x330 [] asymmetric_key_preparse+0x6f/0x100 [] key_create_or_update+0x260/0x5f0 [] SyS_add_key+0x199/0x2a0 [] 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 Cc: Signed-off-by: David Howells Signed-off-by: James Morris --- crypto/asymmetric_keys/x509_cert_parser.c | 1 - 1 file changed, 1 deletion(-) 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); -- 2.20.1