Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.7 426/477] selinux: fix double free | Date | Tue, 23 Jun 2020 21:57:03 +0200 |
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From: Tom Rix <trix@redhat.com>
commit 65de50969a77509452ae590e9449b70a22b923bb upstream.
Clang's static analysis tool reports these double free memory errors.
security/selinux/ss/services.c:2987:4: warning: Attempt to free released memory [unix.Malloc] kfree(bnames[i]); ^~~~~~~~~~~~~~~~ security/selinux/ss/services.c:2990:2: warning: Attempt to free released memory [unix.Malloc] kfree(bvalues); ^~~~~~~~~~~~~~
So improve the security_get_bools error handling by freeing these variables and setting their return pointers to NULL and the return len to 0
Cc: stable@vger.kernel.org Signed-off-by: Tom Rix <trix@redhat.com> Acked-by: Stephen Smalley <stephen.smalley.work@gmail.com> Signed-off-by: Paul Moore <paul@paul-moore.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- security/selinux/ss/services.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -2923,8 +2923,12 @@ err: if (*names) { for (i = 0; i < *len; i++) kfree((*names)[i]); + kfree(*names); } kfree(*values); + *len = 0; + *names = NULL; + *values = NULL; goto out; }
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