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(parent: f3b5384) | patch
fix unbalanced page refcounting in bio_map_user_iov
authorVitaly Mayatskikh <v.mayatskih@gmail.com>
Fri, 22 Sep 2017 05:18:39 +0000 (01:18 -0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 18 Oct 2017 07:20:42 +0000 (09:20 +0200)
commit399c46095eb5d41934c8a99732028a9f1cf0ac50
tree5724438d3693af6c5fe4747cf8474821bd5e1f57tree | snapshot
parentf3b538493e665aa083388818b975ccf27979dec6commit | diff
fix unbalanced page refcounting in bio_map_user_iov

commit 95d78c28b5a85bacbc29b8dba7c04babb9b0d467 upstream.

bio_map_user_iov and bio_unmap_user do unbalanced pages refcounting if
IO vector has small consecutive buffers belonging to the same page.
bio_add_pc_page merges them into one, but the page reference is never
dropped.

Signed-off-by: Vitaly Mayatskikh <v.mayatskih@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
block/bio.c diff | blob | history
Domain: System / Kernel;