diff options
| author | John Pittman <jpittman@redhat.com> | 2019-11-11 16:43:20 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-01 09:14:17 +0100 |
| commit | 02e98a0d49ba63e70af4da25a728ab51d7e6bee8 (patch) | |
| tree | 80213f1e46ce8b1b99c445c01ba2a6795da41db2 /drivers/md | |
| parent | 91bb5e09c9c9820e67e962d5bb00bfb86dcfbf48 (diff) | |
md/raid10: prevent access of uninitialized resync_pages offset
commit 45422b704db392a6d79d07ee3e3670b11048bd53 upstream.
Due to unneeded multiplication in the out_free_pages portion of
r10buf_pool_alloc(), when using a 3-copy raid10 layout, it is
possible to access a resync_pages offset that has not been
initialized. This access translates into a crash of the system
within resync_free_pages() while passing a bad pointer to
put_page(). Remove the multiplication, preventing access to the
uninitialized area.
Fixes: f0250618361db ("md: raid10: don't use bio's vec table to manage resync pages")
Cc: stable@vger.kernel.org # 4.12+
Signed-off-by: John Pittman <jpittman@redhat.com>
Suggested-by: David Jeffery <djeffery@redhat.com>
Reviewed-by: Laurence Oberman <loberman@redhat.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/raid10.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index 433e78f453da..d08d77b9674f 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -226,7 +226,7 @@ static void * r10buf_pool_alloc(gfp_t gfp_flags, void *data) out_free_pages: while (--j >= 0) - resync_free_pages(&rps[j * 2]); + resync_free_pages(&rps[j]); j = 0; out_free_bio: |