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authorNikolay Borisov <kernel@kyup.com>2016-10-10 15:38:18 +0300
committerIlya Dryomov <idryomov@gmail.com>2016-10-15 23:28:07 +0200
commit0d7718f666be181fda1ba2d08f137d87c1419347 (patch)
tree4dcea4e4b40777842736505e655dc05510bb0f2e /fs/ceph/file.c
parent4d73644bc3d76dd161a84e3849c6f2c9c01c4ba7 (diff)
ceph: fix error handling in ceph_read_iter
In case __ceph_do_getattr returns an error and the retry_op in ceph_read_iter is not READ_INLINE, then it's possible to invoke __free_page on a page which is NULL, this naturally leads to a crash. This can happen when, for example, a process waiting on a MDS reply receives sigterm. Fix this by explicitly checking whether the page is set or not. Cc: stable@vger.kernel.org # 3.19+ Signed-off-by: Nikolay Borisov <kernel@kyup.com> Reviewed-by: Yan, Zheng <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'fs/ceph/file.c')
-rw-r--r--fs/ceph/file.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 7bf08825cc11..18630e800208 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -1272,7 +1272,8 @@ again:
statret = __ceph_do_getattr(inode, page,
CEPH_STAT_CAP_INLINE_DATA, !!page);
if (statret < 0) {
- __free_page(page);
+ if (page)
+ __free_page(page);
if (statret == -ENODATA) {
BUG_ON(retry_op != READ_INLINE);
goto again;