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crypto: vmx - fix null dereference in p8_aes_xts_crypt

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walk.iv is not assigned a value in blkcipher_walk_init. It makes iv uninitialized.
It is possibly a null value(as shown below), which is then used by aes_p8_encrypt.

This patch moves iv = walk.iv after blkcipher_walk_virt, in which walk.iv is set.

[17856.268050] Unable to handle kernel paging request for data at address 0x00000000
[17856.268212] Faulting instruction address: 0xd000000002ff04bc
7:mon> t
[link register   ] d000000002ff47b8 p8_aes_xts_crypt+0x168/0x2a0 [vmx_crypto]   (938)
[c000000013b77960] d000000002ff4794 p8_aes_xts_crypt+0x144/0x2a0 [vmx_crypto] (unreliable)
[c000000013b77a70] c000000000544d64 skcipher_decrypt_blkcipher+0x64/0x80
[c000000013b77ac0] d000000003c0175c crypt_convert+0x53c/0x620 [dm_crypt]
[c000000013b77ba0] d000000003c043fc kcryptd_crypt+0x3cc/0x440 [dm_crypt]
[c000000013b77c50] c0000000000f3070 process_one_work+0x1e0/0x590
[c000000013b77ce0] c0000000000f34c8 worker_thread+0xa8/0x660
[c000000013b77d80] c0000000000fc0b0 kthread+0x110/0x130
[c000000013b77e30] c0000000000098f0 ret_from_kernel_thread+0x5c/0x6c

Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Li Zhong 2016-08-24 15:34:40 +08:00 committed by Herbert Xu
parent 10bb087ce3
commit 901d3d4fee
1 changed files with 1 additions and 1 deletions
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2
drivers/crypto/vmx/aes_xts.c
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@ -129,8 +129,8 @@ static int p8_aes_xts_crypt(struct blkcipher_desc *desc,
blkcipher_walk_init(&walk, dst, src, nbytes);
iv = (u8 *)walk.iv;
ret = blkcipher_walk_virt(desc, &walk);
iv = walk.iv;
memset(tweak, 0, AES_BLOCK_SIZE);
aes_p8_encrypt(iv, tweak, &ctx->tweak_key);