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| author | James Morris <jmorris@namei.org> | 2011-06-30 18:43:56 +1000 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2011-06-30 18:43:56 +1000 |
| commit | 5b944a71a192977c1c018bbcfa0c52dca48e2368 (patch) | |
| tree | 9f234c4a93bb28890ad086c846d2bf0b35f7f7ae /fs/romfs/mmap-nommu.c | |
| parent | 0e4ae0e0dec634b2ae53ac57d14141b140467dbe (diff) | |
| parent | c017d0d1351f916c0ced3f358afc491fdcf490b4 (diff) | |
Merge branch 'linus' into next
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 f0511e81696..eed99428f10 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 */ |