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| author | Manfred Spraul <manfred@colorfullife.com> | 2014-12-02 15:59:34 -0800 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2015-10-13 03:46:12 +0100 |
| commit | 0bdf1e820160cdeb16cba1c5ea6892ae982a6587 (patch) | |
| tree | b073fde042d91d45106fe77871e4595e415a6537 /ipc/util.c | |
| parent | 987ad6eef35223b149baf453171b74917c372cbc (diff) | |
| download | kernel_samsung_smdk4412-0bdf1e820160cdeb16cba1c5ea6892ae982a6587.zip kernel_samsung_smdk4412-0bdf1e820160cdeb16cba1c5ea6892ae982a6587.tar.gz kernel_samsung_smdk4412-0bdf1e820160cdeb16cba1c5ea6892ae982a6587.tar.bz2 | |
ipc/sem.c: fully initialize sem_array before making it visible
commit e8577d1f0329d4842e8302e289fb2c22156abef4 upstream.
ipc_addid() makes a new ipc identifier visible to everyone. New objects
start as locked, so that the caller can complete the initialization
after the call. Within struct sem_array, at least sma->sem_base and
sma->sem_nsems are accessed without any locks, therefore this approach
doesn't work.
Thus: Move the ipc_addid() to the end of the initialization.
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Reported-by: Rik van Riel <riel@redhat.com>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Davidlohr Bueso <dave@stgolabs.net>
Acked-by: Rafael Aquini <aquini@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[bwh: Backported to 3.2:
- Adjust context
- The error path being moved looks a little different]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'ipc/util.c')
0 files changed, 0 insertions, 0 deletions