lseek patch for 2.2.18pre23

[H . J . Lu]

2.2.18pre23 allows lseek to negative offsets in ext2 and has no checks
for proc. Here is a patch.

BTW, ext2 2.4-test10 is ok. 

-- 
H.J. Lu ([EMAIL PROTECTED])
---
--- linux/fs/ext2/file.c.lseek  Sat Nov 18 17:18:49 2000
+++ linux/fs/ext2/file.c        Thu Nov 23 21:54:58 2000
@@ -120,6 +120,8 @@ static long long ext2_file_lseek(
                case 1:
                        offset += file->f_pos;
        }
+       if (offset < 0)
+               return -EINVAL;
        if (((unsigned long long) offset >> 32) != 0) {
 #if BITS_PER_LONG < 64
                return -EINVAL;
--- linux/fs/proc/mem.c.lseek   Tue Jan  4 10:12:23 2000
+++ linux/fs/proc/mem.c Sat Nov 18 17:19:28 2000
@@ -196,14 +196,17 @@ static long long mem_lseek(struct file *
 {
        switch (orig) {
                case 0:
-                       file->f_pos = offset;
-                       return file->f_pos;
+                       break;
                case 1:
-                       file->f_pos += offset;
-                       return file->f_pos;
+                       offset += file->f_pos;
+                       break;
                default:
                        return -EINVAL;
        }
+       if (offset < 0)
+                       return -EINVAL;
+       file->f_pos = offset;
+       return offset;
 }
 
 /*
-
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