ipc, shm: make shmem attach/detach wait for mmap_sem killable

[sfrench/cifs-2.6.git] / ipc / shm.c

diff --git a/ipc/shm.c b/ipc/shm.c
index 331fc1b0b3c7952110f0223d741fc4fa19881d70..13282510bc0da71aa9789ff72ba015bede5c96e7 100644 (file)
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -1200,7 +1200,11 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr,
        if (err)
                goto out_fput;
 
-       down_write(&current->mm->mmap_sem);
+       if (down_write_killable(&current->mm->mmap_sem)) {
+               err = -EINTR;
+               goto out_fput;
+       }
+
        if (addr && !(shmflg & SHM_REMAP)) {
                err = -EINVAL;
                if (addr + size < addr)
@@ -1271,7 +1275,8 @@ SYSCALL_DEFINE1(shmdt, char __user *, shmaddr)
        if (addr & ~PAGE_MASK)
                return retval;
 
-       down_write(&mm->mmap_sem);
+       if (down_write_killable(&mm->mmap_sem))
+               return -EINTR;
 
        /*
         * This function tries to be smart and unmap shm segments that