diff --git a/drivers/block/genhd.c b/drivers/block/genhd.c
index 43805e4d31e965991f64c1a0fbb67f30e26a6140..47fd3659a061786967d2d150b5e9ba3212057bc9 100644
--- a/drivers/block/genhd.c
+++ b/drivers/block/genhd.c
@@ -40,7 +40,7 @@ static inline int major_to_index(int major)
 
 #ifdef CONFIG_PROC_FS
 /* get block device names in somewhat random order */
-int get_blkdev_list(char *p)
+int get_blkdev_list(char *p, int used)
 {
 	struct blk_major_name *n;
 	int i, len;
@@ -49,10 +49,18 @@ int get_blkdev_list(char *p)
 
 	down(&block_subsys_sem);
 	for (i = 0; i < ARRAY_SIZE(major_names); i++) {
-		for (n = major_names[i]; n; n = n->next)
+		for (n = major_names[i]; n; n = n->next) {
+			/*
+			 * If the curent string plus the 5 extra characters
+			 * in the line would run us off the page, then we're done
+			 */
+			if ((len + used + strlen(n->name) + 5) >= PAGE_SIZE)
+				goto page_full;
 			len += sprintf(p+len, "%3d %s\n",
 				       n->major, n->name);
+		}
 	}
+page_full:
 	up(&block_subsys_sem);
 
 	return len;
diff --git a/fs/char_dev.c b/fs/char_dev.c
index c1e3537909fc1ae78f829220700810b78f371480..e82aac9cc2f5b9d39101e372cdab81dd971725a0 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -56,10 +56,21 @@ int get_chrdev_list(char *page)
 
 	down(&chrdevs_lock);
 	for (i = 0; i < ARRAY_SIZE(chrdevs) ; i++) {
-		for (cd = chrdevs[i]; cd; cd = cd->next)
+		for (cd = chrdevs[i]; cd; cd = cd->next) {
+			/*
+			 * if the current name, plus the 5 extra characters
+			 * in the device line for this entry
+			 * would run us off the page, we're done
+			 */
+			if ((len+strlen(cd->name) + 5) >= PAGE_SIZE)
+				goto page_full;
+
+
 			len += sprintf(page+len, "%3d %s\n",
 				       cd->major, cd->name);
+		}
 	}
+page_full:
 	up(&chrdevs_lock);
 
 	return len;
diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index 63a9fbf1ac51be4f8bf06d772c70d2c6083cd833..94b570ad037d7e76cd00ebbb5999d42f2df8a0b4 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -451,7 +451,7 @@ static int devices_read_proc(char *page, char **start, off_t off,
 				 int count, int *eof, void *data)
 {
 	int len = get_chrdev_list(page);
-	len += get_blkdev_list(page+len);
+	len += get_blkdev_list(page+len, len);
 	return proc_calc_metrics(page, start, off, count, eof, len);
 }
 
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index af26dc718ef6218e8dc0ed16f3e71a0f9a23d806..01796c41c951619f6afb9e7b3132ea28aec81b86 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -224,7 +224,7 @@ static inline void free_disk_stats(struct gendisk *disk)
 extern void disk_round_stats(struct gendisk *disk);
 
 /* drivers/block/genhd.c */
-extern int get_blkdev_list(char *);
+extern int get_blkdev_list(char *, int);
 extern void add_disk(struct gendisk *disk);
 extern void del_gendisk(struct gendisk *gp);
 extern void unlink_gendisk(struct gendisk *gp);