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| author | Arnd Bergmann <arnd@arndb.de> | 2011-07-15 23:56:37 +0400 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2011-07-15 23:56:37 +0400 |
| commit | 62778396020a29d742abf980c1e83f3df4b5426e (patch) | |
| tree | 08dc01019a1afe6ed16ab79c627ecd81caea52e0 /fs/romfs/mmap-nommu.c | |
| parent | 58f45e3c6f4fd2b9b9d7d43af71409a79a4b4cf6 (diff) | |
| parent | d3144df5bd8eb1c8137cc92989e2e6bc9f2e5a27 (diff) | |
| download | linux-62778396020a29d742abf980c1e83f3df4b5426e.tar.xz | |
Merge branch 'fixes-for-arnd' of git://git.pengutronix.de/git/imx/linux-2.6 into imx/fixes
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 */ |