Hi Jesper, We have tested your changes and all is fine. Thank you for identifying this issue. Regards, Tadeusz -----Original Message----- From: Jesper Juhl [mailto:jj@xxxxxxxxxxxxx] Sent: Sunday, January 16, 2011 2:39 PM To: linux-crypto@xxxxxxxxxxxxxxx Cc: Struk, Tadeusz; linux-kernel@xxxxxxxxxxxxxxx; x86@xxxxxxxxxx; H. Peter Anvin; Ingo Molnar; Thomas Gleixner; David S. Miller; Herbert Xu; Huang, Ying; Hoban, Adrian; Paoloni, Gabriele; O Mahony, Aidan Subject: [PATCH] rfc4106, Intel, AES-NI: Don't leak memory in rfc4106_set_hash_subkey(). There's a small memory leak in arch/x86/crypto/aesni-intel_glue.c::rfc4106_set_hash_subkey(). If the call to kmalloc() fails and returns NULL then the memory allocated previously by ablkcipher_request_alloc() is not freed when we leave the function. I could have just added a call to ablkcipher_request_free() before we return -ENOMEM, but that started to look too much like the code we already had at the end of the function, so I chose instead to rework the code a bit so that there are now a few labels at the end that we goto when various allocations fail, so we don't have to repeat the same blocks of code (this also reduces the object code size slightly). Please review and consider merging. Signed-off-by: Jesper Juhl <jj@xxxxxxxxxxxxx> --- aesni-intel_glue.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) compile tested only. diff --git a/arch/x86/crypto/aesni-intel_glue.c b/arch/x86/crypto/aesni-intel_glue.c index e1e60c7..e013552 100644 --- a/arch/x86/crypto/aesni-intel_glue.c +++ b/arch/x86/crypto/aesni-intel_glue.c @@ -873,21 +873,19 @@ rfc4106_set_hash_subkey(u8 *hash_subkey, const u8 *key, unsigned int key_len) crypto_ablkcipher_clear_flags(ctr_tfm, ~0); ret = crypto_ablkcipher_setkey(ctr_tfm, key, key_len); - if (ret) { - crypto_free_ablkcipher(ctr_tfm); - return ret; - } + if (ret) + goto out; req = ablkcipher_request_alloc(ctr_tfm, GFP_KERNEL); if (!req) { - crypto_free_ablkcipher(ctr_tfm); - return -EINVAL; + ret = -EINVAL; + goto out_free_ablkcipher; } req_data = kmalloc(sizeof(*req_data), GFP_KERNEL); if (!req_data) { - crypto_free_ablkcipher(ctr_tfm); - return -ENOMEM; + ret = -ENOMEM; + goto out_free_request; } memset(req_data->iv, 0, sizeof(req_data->iv)); @@ -913,9 +911,12 @@ rfc4106_set_hash_subkey(u8 *hash_subkey, const u8 *key, unsigned int key_len) if (!ret) ret = req_data->result.err; } +out_free_request: ablkcipher_request_free(req); kfree(req_data); +out_free_ablkcipher: crypto_free_ablkcipher(ctr_tfm); +out: return ret; } -- Jesper Juhl <jj@xxxxxxxxxxxxx> http://www.chaosbits.net/ Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html Plain text mails only, please. -------------------------------------------------------------- Intel Shannon Limited Registered in Ireland Registered Office: Collinstown Industrial Park, Leixlip, County Kildare Registered Number: 308263 Business address: Dromore House, East Park, Shannon, Co. Clare This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies. -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
