lib/mpi: Fix SG miter leak
In mpi_read_raw_from_sgl we may leak the SG miter resouces after
reading the leading zeroes. This patch fixes this by stopping the
iteration once the leading zeroes have been read.
Fixes: 127827b9c295 ("lib/mpi: Do not do sg_virt")
Reported-by: Nicolai Stange <nicstange@gmail.com>
Tested-by: Nicolai Stange <nicstange@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/lib/mpi/mpicoder.c b/lib/mpi/mpicoder.c
index c6272ae..5a0f75a 100644
--- a/lib/mpi/mpicoder.c
+++ b/lib/mpi/mpicoder.c
@@ -363,6 +363,9 @@
lzeros = 0;
}
+ miter.consumed = lzeros;
+ sg_miter_stop(&miter);
+
nbytes -= lzeros;
nbits = nbytes * 8;
if (nbits > MAX_EXTERN_MPI_BITS) {
@@ -390,7 +393,10 @@
z = BYTES_PER_MPI_LIMB - nbytes % BYTES_PER_MPI_LIMB;
z %= BYTES_PER_MPI_LIMB;
- for (;;) {
+ while (sg_miter_next(&miter)) {
+ buff = miter.addr;
+ len = miter.length;
+
for (x = 0; x < len; x++) {
a <<= 8;
a |= *buff++;
@@ -400,12 +406,6 @@
}
}
z += x;
-
- if (!sg_miter_next(&miter))
- break;
-
- buff = miter.addr;
- len = miter.length;
}
return val;