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| author | David S. Miller <davem@davemloft.net> | 2011-07-05 23:23:37 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-07-05 23:23:37 -0700 |
| commit | e12fe68ce34d60c04bb1ddb1d3cc5c3022388fe4 (patch) | |
| tree | 83c0e192ccaa4752c80b6131a7d0aa8272b5d0d0 /fs/romfs/mmap-nommu.c | |
| parent | 7329f0d58de01878d9ce4f0be7a76e136f223eef (diff) | |
| parent | 712ae51afd55b20c04c5383d02ba5d10233313b1 (diff) | |
| download | linux-e12fe68ce34d60c04bb1ddb1d3cc5c3022388fe4.tar.gz | |
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
Diffstat (limited to 'fs/romfs/mmap-nommu.c')
| -rw-r--r-- | fs/romfs/mmap-nommu.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/romfs/mmap-nommu.c b/fs/romfs/mmap-nommu.c index f0511e816967..eed99428f104 100644 --- a/fs/romfs/mmap-nommu.c +++ b/fs/romfs/mmap-nommu.c @@ -27,14 +27,18 @@ static unsigned long romfs_get_unmapped_area(struct file *file, { struct inode *inode = file->f_mapping->host; struct mtd_info *mtd = inode->i_sb->s_mtd; - unsigned long isize, offset; + unsigned long isize, offset, maxpages, lpages; if (!mtd) goto cant_map_directly; + /* the mapping mustn't extend beyond the EOF */ + lpages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; isize = i_size_read(inode); offset = pgoff << PAGE_SHIFT; - if (offset > isize || len > isize || offset > isize - len) + + maxpages = (isize + PAGE_SIZE - 1) >> PAGE_SHIFT; + if ((pgoff >= maxpages) || (maxpages - pgoff < lpages)) return (unsigned long) -EINVAL; /* we need to call down to the MTD layer to do the actual mapping */ |