lkml.org 
[lkml]   [2021]   [Feb]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 4.4 33/35] xen-blkback: fix error handling in xen_blkbk_map()
Date
From: Jan Beulich <jbeulich@suse.com>

commit 871997bc9e423f05c7da7c9178e62dde5df2a7f8 upstream.

The function uses a goto-based loop, which may lead to an earlier error
getting discarded by a later iteration. Exit this ad-hoc loop when an
error was encountered.

The out-of-memory error path additionally fails to fill a structure
field looked at by xen_blkbk_unmap_prepare() before inspecting the
handle which does get properly set (to BLKBACK_INVALID_HANDLE).

Since the earlier exiting from the ad-hoc loop requires the same field
filling (invalidation) as that on the out-of-memory path, fold both
paths. While doing so, drop the pr_alert(), as extra log messages aren't
going to help the situation (the kernel will log oom conditions already
anyway).

This is XSA-365.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Julien Grall <julien@xen.org>
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/block/xen-blkback/blkback.c | 22 ++++++++++++++--------
1 file changed, 14 insertions(+), 8 deletions(-)

--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -825,8 +825,11 @@ again:
pages[i]->page = persistent_gnt->page;
pages[i]->persistent_gnt = persistent_gnt;
} else {
- if (get_free_page(blkif, &pages[i]->page))
- goto out_of_memory;
+ if (get_free_page(blkif, &pages[i]->page)) {
+ put_free_pages(blkif, pages_to_gnt, segs_to_map);
+ ret = -ENOMEM;
+ goto out;
+ }
addr = vaddr(pages[i]->page);
pages_to_gnt[segs_to_map] = pages[i]->page;
pages[i]->persistent_gnt = NULL;
@@ -910,15 +913,18 @@ next:
}
segs_to_map = 0;
last_map = map_until;
- if (map_until != num)
+ if (!ret && map_until != num)
goto again;

- return ret;
+out:
+ for (i = last_map; i < num; i++) {
+ /* Don't zap current batch's valid persistent grants. */
+ if(i >= last_map + segs_to_map)
+ pages[i]->persistent_gnt = NULL;
+ pages[i]->handle = BLKBACK_INVALID_HANDLE;
+ }

-out_of_memory:
- pr_alert("%s: out of memory\n", __func__);
- put_free_pages(blkif, pages_to_gnt, segs_to_map);
- return -ENOMEM;
+ return ret;
}

static int xen_blkbk_map_seg(struct pending_req *pending_req)

\
 
 \ /
  Last update: 2021-02-22 14:40    [W:1.998 / U:0.012 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site