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-rw-r--r--fs/nfs/direct.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index 04ab2fc360e..4e9b3a1b36c 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -57,6 +57,7 @@
#define NFSDBG_FACILITY NFSDBG_VFS
#define MAX_DIRECTIO_SIZE (4096UL << PAGE_SHIFT)
+static void nfs_free_user_pages(struct page **pages, int npages, int do_dirty);
static kmem_cache_t *nfs_direct_cachep;
/*
@@ -107,6 +108,15 @@ nfs_get_user_pages(int rw, unsigned long user_addr, size_t size,
page_count, (rw == READ), 0,
*pages, NULL);
up_read(&current->mm->mmap_sem);
+ /*
+ * If we got fewer pages than expected from get_user_pages(),
+ * the user buffer runs off the end of a mapping; return EFAULT.
+ */
+ if (result >= 0 && result < page_count) {
+ nfs_free_user_pages(*pages, result, 0);
+ *pages = NULL;
+ result = -EFAULT;
+ }
}
return result;
}