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| author | Andreas Gruenbacher <agruenba@redhat.com> | 2017-10-09 11:13:18 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2017-10-11 05:10:02 +0200 |
| commit | 899f0429c7d3eed886406cd72182bee3b96aa1f9 (patch) | |
| tree | 9788036e0f8aa463f6feca6dd8d8a06eeaf8728b /fs | |
| parent | Linux 4.14-rc4 (diff) | |
| download | linux-899f0429c7d3eed886406cd72182bee3b96aa1f9.tar.xz linux-899f0429c7d3eed886406cd72182bee3b96aa1f9.zip | |
direct-io: Prevent NULL pointer access in submit_page_section
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.
Cc: stable@vger.kernel.org # v3.10+
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>
Diffstat (limited to 'fs')
| -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 62cf812ed0e5..96415c65bbdc 100644 --- a/fs/direct-io.c +++ b/fs/direct-io.c @@ -866,7 +866,8 @@ 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); put_page(sdio->cur_page); sdio->cur_page = NULL; } |