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| author | Tony Battersby <tonyb@cybernetics.com> | 2009-04-02 16:58:26 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-02 19:05:01 -0700 |
| commit | e562aebc6ccd4385cbbf24debe88ab4bb500c5b4 (patch) | |
| tree | a9dee6eac97d75c688a84d5fe268b2e5a0b73e23 | |
| parent | 40e8a10de2c9f87e892dcd5a6f9d1b208329ffea (diff) | |
| download | lwn-e562aebc6ccd4385cbbf24debe88ab4bb500c5b4.tar.gz lwn-e562aebc6ccd4385cbbf24debe88ab4bb500c5b4.zip | |
ipc: make shm_get_stat() more robust
shm_get_stat() assumes idr_find(&shm_ids(ns).ipcs_idr) returns "struct
shmid_kernel *"; all other callers assume that it returns "struct
kern_ipc_perm *". This works because "struct kern_ipc_perm" is currently
the first member of "struct shmid_kernel", but it would be better to use
container_of() to prevent future breakage.
Signed-off-by: Tony Battersby <tonyb@cybernetics.com>
Cc: Jiri Olsa <olsajiri@gmail.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | ipc/shm.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/ipc/shm.c b/ipc/shm.c index f239d87e0d37..faa46da99ebe 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -555,12 +555,14 @@ static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss, in_use = shm_ids(ns).in_use; for (total = 0, next_id = 0; total < in_use; next_id++) { + struct kern_ipc_perm *ipc; struct shmid_kernel *shp; struct inode *inode; - shp = idr_find(&shm_ids(ns).ipcs_idr, next_id); - if (shp == NULL) + ipc = idr_find(&shm_ids(ns).ipcs_idr, next_id); + if (ipc == NULL) continue; + shp = container_of(ipc, struct shmid_kernel, shm_perm); inode = shp->shm_file->f_path.dentry->d_inode; |