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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>
steinar/wifi_calib_4_9_kernel
Nikolay Borisov 2016-10-10 15:38:18 +03:00 committed by Ilya Dryomov
parent 4d73644bc3
commit 0d7718f666
1 changed files with 2 additions and 1 deletions
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3
fs/ceph/file.c
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@ -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;