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authorOleg Nesterov <oleg@redhat.com>2014-12-11 02:45:10 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2014-12-11 04:41:09 +0300
commit4af1036df4dd4f0d59fad9d82ed456bfa2e73fa6 (patch)
treedb1e1ccc62ddffb35e429d9d306752a27ac4d9de /fs
parent2fc1e948e820bddf8a686c6e2989219b471d7982 (diff)
downloadlinux-4af1036df4dd4f0d59fad9d82ed456bfa2e73fa6.tar.xz
proc: task_state: read cred->group_info outside of task_lock()
task_state() reads cred->group_info under task_lock() because a long ago it was task_struct->group_info and it was actually protected by task->alloc_lock. Today this task_unlock() after rcu_read_unlock() just adds the confusion, move task_unlock() up. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: Aaron Tomlin <atomlin@redhat.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com>, Cc: Sterling Alexander <stalexan@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Roland McGrath <roland@hack.frob.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/proc/array.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/proc/array.c b/fs/proc/array.c
index cd3653e4f35c..b5810c228c10 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -201,11 +201,10 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
"FDSize:\t%d\n"
"Groups:\t",
fdt ? fdt->max_fds : 0);
+ task_unlock(p);
rcu_read_unlock();
group_info = cred->group_info;
- task_unlock(p);
-
for (g = 0; g < group_info->ngroups; g++)
seq_printf(m, "%d ",
from_kgid_munged(user_ns, GROUP_AT(group_info, g)));