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| author | Ingo Molnar <mingo@elte.hu> | 2011-07-01 10:28:42 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-07-01 10:28:46 +0200 |
| commit | 10e6962765f8213941eaa1cbb9de425ff0689e2e (patch) | |
| tree | c277e4ac5b2b7156152454578c39e90da5127dd8 /fs/romfs/mmap-nommu.c | |
| parent | af07ce3e77d3b24ab1d71fcc5833d41800f23b2b (diff) | |
| parent | b0af8dfdd67699e25083478c63eedef2e72ebd85 (diff) | |
Merge commit 'v3.0-rc5' into perf/core
Merge reason: Pick up the latest fixes.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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 */ |