From: Roberto Sassu <roberto.sassu@xxxxxxxxxx>
commit 60386b854008adc951c470067f90a2d85b5d520f upstream.
Errors returned by crypto_shash_update() are not checked in
ima_calc_boot_aggregate_tfm() and thus can be overwritten at the next
iteration of the loop. This patch adds a check after calling
crypto_shash_update() and returns immediately if the result is not zero.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 3323eec921efd ("integrity: IMA as an integrity service provider")
Signed-off-by: Roberto Sassu <roberto.sassu@xxxxxxxxxx>
Signed-off-by: Mimi Zohar <zohar@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
security/integrity/ima/ima_crypto.c | 2 ++
1 file changed, 2 insertions(+)
--- a/security/integrity/ima/ima_crypto.c
+++ b/security/integrity/ima/ima_crypto.c
@@ -555,6 +555,8 @@ static int __init ima_calc_boot_aggregat
ima_pcrread(i, pcr_i);
/* now accumulate with current aggregate */
rc = crypto_shash_update(shash, pcr_i, TPM_DIGEST_SIZE);
+ if (rc != 0)
+ return rc;
}
if (!rc)
crypto_shash_final(shash, digest);
