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Subjectlseek patch for 2.2.18pre23
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 (hjl@valinux.com)
---
--- 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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