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| author | Andreas Gruenbacher <agruenba@redhat.com> | 2017-10-09 12:13:18 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-10-18 10:15:16 +0300 |
| commit | 2159252e70e95ba59e926423a006b95c313a0eea (patch) | |
| tree | 25abfe7702f878504e66c259eb3ba548cb12b830 /fs/direct-io.c | |
| parent | a2b295db33d4371bf80cadede1965138a90883db (diff) | |
| download | linux-2159252e70e95ba59e926423a006b95c313a0eea.tar.xz | |
direct-io: Prevent NULL pointer access in submit_page_section
commit 899f0429c7d3eed886406cd72182bee3b96aa1f9 upstream.
In the code added to function submit_page_section by commit b1058b981,
sdio->bio can currently be NULL when calling dio_bio_submit. This then
leads to a NULL pointer access in dio_bio_submit, so check for a NULL
bio in submit_page_section before trying to submit it instead.
Fixes xfstest generic/250 on gfs2.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/direct-io.c')
| -rw-r--r-- | fs/direct-io.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/direct-io.c b/fs/direct-io.c index e181b6b2e297..a325d8c5ec2d 100644 --- a/fs/direct-io.c +++ b/fs/direct-io.c @@ -812,7 +812,8 @@ out: */ if (sdio->boundary) { ret = dio_send_cur_page(dio, sdio, map_bh); - dio_bio_submit(dio, sdio); + if (sdio->bio) + dio_bio_submit(dio, sdio); page_cache_release(sdio->cur_page); sdio->cur_page = NULL; } |