diff options
| author | Jens Axboe <axboe@kernel.dk> | 2018-02-07 15:54:20 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-02-07 15:54:20 -0700 |
| commit | 61a695184fcc8f225327206b88320279dd8684af (patch) | |
| tree | 6cbda2b0e7de94ebad95072d17cc0aa82c9d8ab3 /ipc/shm.c | |
| parent | 9e05c864993c5442227f83ae1694a737d7a102ed (diff) | |
| parent | 581e400ff935d34d95811258586128bf11baef15 (diff) | |
Merge branch 'master' into test
* master: (1190 commits)
ASoC: stm32: add of dependency for stm32 drivers
ASoC: mt8173-rt5650: fix child-node lookup
ASoC: dapm: fix debugfs read using path->connected
platform/x86: samsung-laptop: Re-use DEFINE_SHOW_ATTRIBUTE() macro
platform/x86: ideapad-laptop: Re-use DEFINE_SHOW_ATTRIBUTE() macro
platform/x86: dell-laptop: Re-use DEFINE_SHOW_ATTRIBUTE() macro
seq_file: Introduce DEFINE_SHOW_ATTRIBUTE() helper macro
Documentation/sysctl/user.txt: fix typo
MAINTAINERS: update ARM/QUALCOMM SUPPORT patterns
MAINTAINERS: update various PALM patterns
MAINTAINERS: update "ARM/OXNAS platform support" patterns
MAINTAINERS: update Cortina/Gemini patterns
MAINTAINERS: remove ARM/CLKDEV SUPPORT file pattern
MAINTAINERS: remove ANDROID ION pattern
mm: docs: add blank lines to silence sphinx "Unexpected indentation" errors
mm: docs: fix parameter names mismatch
mm: docs: fixup punctuation
pipe: read buffer limits atomically
pipe: simplify round_pipe_size()
pipe: reject F_SETPIPE_SZ with size over UINT_MAX
...
Diffstat (limited to 'ipc/shm.c')
| -rw-r--r-- | ipc/shm.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/ipc/shm.c b/ipc/shm.c index 7acda23430aa..4643865e9171 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -909,9 +909,11 @@ static int shmctl_stat(struct ipc_namespace *ns, int shmid, int cmd, struct shmid64_ds *tbuf) { struct shmid_kernel *shp; - int result; + int id = 0; int err; + memset(tbuf, 0, sizeof(*tbuf)); + rcu_read_lock(); if (cmd == SHM_STAT) { shp = shm_obtain_object(ns, shmid); @@ -919,14 +921,13 @@ static int shmctl_stat(struct ipc_namespace *ns, int shmid, err = PTR_ERR(shp); goto out_unlock; } - result = shp->shm_perm.id; + id = shp->shm_perm.id; } else { shp = shm_obtain_object_check(ns, shmid); if (IS_ERR(shp)) { err = PTR_ERR(shp); goto out_unlock; } - result = 0; } err = -EACCES; @@ -937,7 +938,14 @@ static int shmctl_stat(struct ipc_namespace *ns, int shmid, if (err) goto out_unlock; - memset(tbuf, 0, sizeof(*tbuf)); + ipc_lock_object(&shp->shm_perm); + + if (!ipc_valid_object(&shp->shm_perm)) { + ipc_unlock_object(&shp->shm_perm); + err = -EIDRM; + goto out_unlock; + } + kernel_to_ipc64_perm(&shp->shm_perm, &tbuf->shm_perm); tbuf->shm_segsz = shp->shm_segsz; tbuf->shm_atime = shp->shm_atim; @@ -946,8 +954,10 @@ static int shmctl_stat(struct ipc_namespace *ns, int shmid, tbuf->shm_cpid = shp->shm_cprid; tbuf->shm_lpid = shp->shm_lprid; tbuf->shm_nattch = shp->shm_nattch; + + ipc_unlock_object(&shp->shm_perm); rcu_read_unlock(); - return result; + return id; out_unlock: rcu_read_unlock(); |