3.10-stable review patch. If anyone has any objections, please let me know.
------------------ From: Davidlohr Bueso <[email protected]> commit 530fcd16d87cd2417c472a581ba5a1e501556c86 upstream. When !CONFIG_MMU there's a chance we can derefence a NULL pointer when the VM area isn't found - check the return value of find_vma(). Also, remove the redundant -EINVAL return: retval is set to the proper return code and *only* changed to 0, when we actually unmap the segments. Signed-off-by: Davidlohr Bueso <[email protected]> Cc: Sedat Dilek <[email protected]> Cc: Rik van Riel <[email protected]> Cc: Manfred Spraul <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> Cc: Mike Galbraith <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- ipc/shm.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/ipc/shm.c +++ b/ipc/shm.c @@ -1288,8 +1288,7 @@ SYSCALL_DEFINE1(shmdt, char __user *, sh #else /* CONFIG_MMU */ /* under NOMMU conditions, the exact address to be destroyed must be * given */ - retval = -EINVAL; - if (vma->vm_start == addr && vma->vm_ops == &shm_vm_ops) { + if (vma && vma->vm_start == addr && vma->vm_ops == &shm_vm_ops) { do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start); retval = 0; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
