Description
In the Linux kernel, the following vulnerability has been resolved: net/rds: reset op_nents when zerocopy page pin fails When iov_iter_get_pages2() fails in rds_message_zcopy_from_user(), the pinned pages are released with put_page(), and rm->data.op_mmp_znotifier is cleared. But we fail to properly clear rm->data.op_nents. Later when rds_message_purge() is called from rds_sendmsg() the cleanup loop iterates over the incorrectly non zero number of op_nents and frees them again. Fix this by properly resetting op_nents when it should be in rds_message_zcopy_from_user().
Product status
0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 (git) before e174929793195e0cd6a4adb0cad731b39f9019b4
4.17
Any version before 4.17
7.1-rc4 (original_commit_for_fix)
References
git.kernel.org/…c/e174929793195e0cd6a4adb0cad731b39f9019b4
