[patch] nfs-client-directio-panic-with-compile-fix.patch

nfs-client-directio-panic-with-compile-fix.patch (text/plain), 800 bytes, created by RumpletonBongworth on 2006-03-07 20:44:19 UTC

--- linux-2.6.14.7.orig/fs/nfs/direct.c	2005-10-27 19:02:08.000000000 -0500
+++ linux-2.6.14.7/fs/nfs/direct.c	2006-03-07 23:41:30.000000000 -0500
@@ -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 @@
 					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;
 }