Add a missing ENOMEM check.

Signed-off-by: David Howells <dhowe...@redhat.com>
---

 lib/mpi/mpicoder.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)


diff --git a/lib/mpi/mpicoder.c b/lib/mpi/mpicoder.c
index fe84bb9..6e225a8 100644
--- a/lib/mpi/mpicoder.c
+++ b/lib/mpi/mpicoder.c
@@ -255,6 +255,8 @@ void *mpi_get_buffer(MPI a, unsigned *nbytes, int *sign)
        if (!n)
                n++;            /* avoid zero length allocation */
        p = buffer = kmalloc(n, GFP_KERNEL);
+       if (p < 0)
+               return NULL;
 
        for (i = a->nlimbs - 1; i >= 0; i--) {
                alimb = a->d[i];

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