The patch titled
cred: fix memory and refcount leaks upon security_prepare_creds() failure
has been removed from the -mm tree. Its filename was
cred-fix-memory-and-refcount-leaks-upon-security_prepare_creds-failure.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: cred: fix memory and refcount leaks upon security_prepare_creds()
failure
From: Tetsuo Handa <[email protected]>
In prepare_kernel_cred() since 2.6.29, put_cred(new) is called without
assigning new->usage when security_prepare_creds() returned an error. As
a result, memory for new and refcount for new->{user,group_info,tgcred}
are leaked because put_cred(new) won't call __put_cred() unless old->usage
== 1.
Fix these leaks by assigning new->usage (and new->subscribers which was
added in 2.6.32) before calling security_prepare_creds().
Signed-off-by: Tetsuo Handa <[email protected]>
Signed-off-by: David Howells <[email protected]>
Cc: James Morris <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
kernel/cred.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff -puN
kernel/cred.c~cred-fix-memory-and-refcount-leaks-upon-security_prepare_creds-failure
kernel/cred.c
---
a/kernel/cred.c~cred-fix-memory-and-refcount-leaks-upon-security_prepare_creds-failure
+++ a/kernel/cred.c
@@ -657,6 +657,8 @@ struct cred *prepare_kernel_cred(struct
validate_creds(old);
*new = *old;
+ atomic_set(&new->usage, 1);
+ set_cred_subscribers(new, 0);
get_uid(new->user);
get_group_info(new->group_info);
@@ -674,8 +676,6 @@ struct cred *prepare_kernel_cred(struct
if (security_prepare_creds(new, old, GFP_KERNEL) < 0)
goto error;
- atomic_set(&new->usage, 1);
- set_cred_subscribers(new, 0);
put_cred(old);
validate_creds(new);
return new;
_
Patches currently in -mm which might be from [email protected]
are
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