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| author | Dave Hansen <dave.hansen@linux.intel.com> | 2014-12-12 16:58:22 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-12-13 12:42:52 -0800 |
| commit | 07a46ed27dc6344de831a450df82336270a157a9 (patch) | |
| tree | 01d7b8df9f8419878ab9e6ff0678ee26ae20d00c /ipc/shm.c | |
| parent | d3c97900b427b8d5a476fdfe484267f09df418d6 (diff) | |
| download | lwn-07a46ed27dc6344de831a450df82336270a157a9.tar.gz lwn-07a46ed27dc6344de831a450df82336270a157a9.zip | |
shmdt: use i_size_read() instead of ->i_size
Andrew Morton noted
http://lkml.kernel.org/r/20141104142027.a7a0d010772d84560b445f59@linux-foundation.org
that the shmdt uses inode->i_size outside of i_mutex being held.
There is one more case in shm.c in shm_destroy(). This converts
both users over to use i_size_read().
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
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 | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/ipc/shm.c b/ipc/shm.c index e5dc7d246f05..19633b4a2350 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -219,7 +219,8 @@ static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp) if (!is_file_hugepages(shm_file)) shmem_lock(shm_file, 0, shp->mlock_user); else if (shp->mlock_user) - user_shm_unlock(file_inode(shm_file)->i_size, shp->mlock_user); + user_shm_unlock(i_size_read(file_inode(shm_file)), + shp->mlock_user); fput(shm_file); ipc_rcu_putref(shp, shm_rcu_free); } @@ -1280,7 +1281,7 @@ SYSCALL_DEFINE1(shmdt, char __user *, shmaddr) * in the range we are unmapping. */ file = vma->vm_file; - size = file_inode(file)->i_size; + size = i_size_read(file_inode(vma->vm_file)); do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start); /* * We discovered the size of the shm segment, so |