diff options
| author | Davidlohr Bueso <dave@stgolabs.net> | 2017-05-08 15:57:03 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-05-08 17:15:12 -0700 |
| commit | f0cb88026f51a0d8c952cf5e09e1933ef10b50b4 (patch) | |
| tree | 734ec3b8c74c2e6915d4dcfb16ea3cb2432e4c50 /ipc/shm.c | |
| parent | 046aa1265f08d8400bd4b63171238c9daba15ec3 (diff) | |
| download | lwn-f0cb88026f51a0d8c952cf5e09e1933ef10b50b4.tar.gz lwn-f0cb88026f51a0d8c952cf5e09e1933ef10b50b4.zip | |
ipc/shm: some shmat cleanups
Clean up early flag and address some minutia.
Link: http://lkml.kernel.org/r/1486673582-6979-3-git-send-email-dave@stgolabs.net
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc/shm.c')
| -rw-r--r-- | ipc/shm.c | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/ipc/shm.c b/ipc/shm.c index 481d2a9c298a..34c4344e8d4b 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -1095,11 +1095,11 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr, unsigned long shmlba) { struct shmid_kernel *shp; - unsigned long addr; + unsigned long addr = (unsigned long)shmaddr; unsigned long size; struct file *file; int err; - unsigned long flags; + unsigned long flags = MAP_SHARED; unsigned long prot; int acc_mode; struct ipc_namespace *ns; @@ -1111,7 +1111,8 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, err = -EINVAL; if (shmid < 0) goto out; - else if ((addr = (ulong)shmaddr)) { + + if (addr) { if (addr & (shmlba - 1)) { /* * Round down to the nearest multiple of shmlba. @@ -1126,13 +1127,10 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, #endif goto out; } - flags = MAP_SHARED | MAP_FIXED; - } else { - if ((shmflg & SHM_REMAP)) - goto out; - flags = MAP_SHARED; - } + flags |= MAP_FIXED; + } else if ((shmflg & SHM_REMAP)) + goto out; if (shmflg & SHM_RDONLY) { prot = PROT_READ; |