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mac80211: fils_aead: fix encrypt error handling 

gcc -Wmaybe-uninitialized reports a bug in aes_siv_encryp:

net/mac80211/fils_aead.c: In function ‘aes_siv_encrypt.constprop’:
net/mac80211/fils_aead.c:84:26: error: ‘tfm2’ may be used uninitialized in this function [-Werror=maybe-uninitialized]

At the time that the memory allocation fails, 'tfm2' has not been
allocated, so we should not attempt to free it later, and we can
simply return an error.

Fixes: 39404feee6 ("mac80211: FILS AEAD protection for station mode association frames")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Arnd Bergmann 2016-10-28 12:25:53 +02:00 committed by Johannes Berg
parent 088e8df82f
commit 514877182b
1 changed files with 2 additions and 4 deletions
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6
net/mac80211/fils_aead.c
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@ -110,10 +110,8 @@ static int aes_siv_encrypt(const u8 *key, size_t key_len,
* overwriting this during AES-CTR.
*/
tmp = kmemdup(plain, plain_len, GFP_KERNEL);
if (!tmp) {
res = -ENOMEM;
goto fail;
}
if (!tmp)
return -ENOMEM;
/* IV for CTR before encrypted data */
memcpy(out, v, AES_BLOCK_SIZE);