summaryrefslogtreecommitdiff
path: root/fs/cifs/smb2maperror.c
diff options
context:
space:
mode:
authorElena Reshetova <elena.reshetova@intel.com>2017-10-20 10:23:48 +0300
committerDavid S. Miller <davem@davemloft.net>2017-10-22 04:22:39 +0300
commit709c89b45b874b2f81a074b8802a736009873f48 (patch)
tree80ef98e8c9744487746d29eb1313d39762a08ac8 /fs/cifs/smb2maperror.c
parentd780cd44e3cea119a3346e6d7c04d35b9c50d54b (diff)
downloadlinux-709c89b45b874b2f81a074b8802a736009873f48.tar.xz
drivers, net, ppp: convert syncppp.refcnt from atomic_t to refcount_t
atomic_t variables are currently used to implement reference counters with the following properties: - counter is initialized to 1 using atomic_set() - a resource is freed upon counter reaching zero - once counter reaches zero, its further increments aren't allowed - counter schema uses basic atomic operations (set, inc, inc_not_zero, dec_and_test, etc.) Such atomic variables should be converted to a newly provided refcount_t type and API that prevents accidental counter overflows and underflows. This is important since overflows and underflows can lead to use-after-free situation and be exploitable. The variable syncppp.refcnt is used as pure reference counter. Convert it to refcount_t and fix up the operations. Suggested-by: Kees Cook <keescook@chromium.org> Reviewed-by: David Windsor <dwindsor@gmail.com> Reviewed-by: Hans Liljestrand <ishkamiel@gmail.com> Signed-off-by: Elena Reshetova <elena.reshetova@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'fs/cifs/smb2maperror.c')
0 files changed, 0 insertions, 0 deletions