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| author | David Howells <dhowells@redhat.com> | 2008-12-01 13:14:00 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-12-01 19:55:24 -0800 |
| commit | 4280e3126f641898f0ed1a931645373d3489e2a6 (patch) | |
| tree | d4ba29d8a61958e0e039d144734c883e50232e15 | |
| parent | a8005992836434cab6182c6147993d21442184c1 (diff) | |
| download | lwn-4280e3126f641898f0ed1a931645373d3489e2a6.tar.gz lwn-4280e3126f641898f0ed1a931645373d3489e2a6.zip | |
frv: fix mmap2 error handling
Fix the error handling in sys_mmap2(). Currently, if the pgoff check
fails, fput() might have to be called (which it isn't), so do the pgoff
check first, before fget() is called.
Signed-off-by: David Howells <dhowells@redhat.com>
Reported-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | arch/frv/kernel/sys_frv.c | 17 |
1 files changed, 8 insertions, 9 deletions
diff --git a/arch/frv/kernel/sys_frv.c b/arch/frv/kernel/sys_frv.c index 49b2cf2c38f3..baadc97f8627 100644 --- a/arch/frv/kernel/sys_frv.c +++ b/arch/frv/kernel/sys_frv.c @@ -35,22 +35,21 @@ asmlinkage long sys_mmap2(unsigned long addr, unsigned long len, int error = -EBADF; struct file * file = NULL; - flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); - if (!(flags & MAP_ANONYMOUS)) { - file = fget(fd); - if (!file) - goto out; - } - /* As with sparc32, make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE we have.... */ /* But unlike sparc32, don't just silently break if we're trying to map something we can't */ - if (pgoff & ((1<<(PAGE_SHIFT-12))-1)) + if (pgoff & ((1 << (PAGE_SHIFT - 12)) - 1)) return -EINVAL; + pgoff >>= PAGE_SHIFT - 12; - pgoff >>= (PAGE_SHIFT - 12); + flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); + if (!(flags & MAP_ANONYMOUS)) { + file = fget(fd); + if (!file) + goto out; + } down_write(¤t->mm->mmap_sem); error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); |