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-rw-r--r--lib/digsig.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/lib/digsig.c b/lib/digsig.c
index fd2402f67f89..5d840ac64fb1 100644
--- a/lib/digsig.c
+++ b/lib/digsig.c
@@ -105,6 +105,10 @@ static int digsig_verify_rsa(struct key *key,
down_read(&key->sem);
ukp = key->payload.data;
+
+ if (ukp->datalen < sizeof(*pkh))
+ goto err1;
+
pkh = (struct pubkey_hdr *)ukp->data;
if (pkh->version != 1)
@@ -117,7 +121,7 @@ static int digsig_verify_rsa(struct key *key,
goto err1;
datap = pkh->mpi;
- endp = datap + ukp->datalen;
+ endp = ukp->data + ukp->datalen;
for (i = 0; i < pkh->nmpi; i++) {
unsigned int remaining = endp - datap;
@@ -128,7 +132,8 @@ static int digsig_verify_rsa(struct key *key,
mblen = mpi_get_nbits(pkey[0]);
mlen = (mblen + 7)/8;
- err = -ENOMEM;
+ if (mlen == 0)
+ goto err;
out1 = kzalloc(mlen, GFP_KERNEL);
if (!out1)