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(parent: b3e3437) | 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)
committerAl Viro <viro@zeniv.linux.org.uk>
Wed, 11 Oct 2017 03:54:51 +0000 (23:54 -0400)
commit62f233499a7653686bb52e63c75e9ed12a7c1da2
tree171528916186018b071110eced6ebc55f5d6b3c3tree | snapshot
parentb3e343711b3a299eb9f1e450605d7297258b2bcecommit | diff
fix unbalanced page refcounting in bio_map_user_iov

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.

Cc: stable@vger.kernel.org
Signed-off-by: Vitaly Mayatskikh <v.mayatskih@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
block/bio.c diff | blob | history
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