Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1220048

[PATCH] zram: fix possible use after free in zcomp_create()

Show all headers | View raw

zcomp_create() verifies the success of zcomp_strm_{multi,siggle}_create()
through comp->stream, which can potentially be pointing to memory that was
freed if these functions returned an error.

Fixes: beca3ec71fe5 ("zram: add multi stream functionality")
Cc: stable@vger.kernel.org
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
---
 drivers/block/zram/zcomp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/block/zram/zcomp.c b/drivers/block/zram/zcomp.c
index 965d1afb0eaa..f3db8158e172 100644
--- a/drivers/block/zram/zcomp.c
+++ b/drivers/block/zram/zcomp.c
@@ -212,6 +212,7 @@ static int zcomp_strm_multi_create(struct zcomp *comp, int max_strm)
 	zstrm = zcomp_strm_alloc(comp);
 	if (!zstrm) {
 		kfree(zs);
+		comp->stream = NULL;
 		return -ENOMEM;
 	}
 	list_add(&zstrm->list, &zs->idle_strm);
@@ -262,6 +263,7 @@ static int zcomp_strm_single_create(struct zcomp *comp)
 	zs->zstrm = zcomp_strm_alloc(comp);
 	if (!zs->zstrm) {
 		kfree(zs);
+		comp->stream = NULL;
 		return -ENOMEM;
 	}
 	return 0;
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

[PATCH] zram: fix possible use after free in zcomp_create() Luis Henriques <luis.henriques@canonical.com> - 2015-09-07 12:40 +0200
  Re: [PATCH] zram: fix possible use after free in zcomp_create() Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2015-09-07 13:20 +0200
    Re: [PATCH] zram: fix possible use after free in zcomp_create() Luis Henriques <luis.henriques@canonical.com> - 2015-09-07 15:00 +0200
      Re: [PATCH] zram: fix possible use after free in zcomp_create() Sergey Senozhatsky <sergey.senozhatsky@gmail.com> - 2015-09-07 15:40 +0200
        Re: [PATCH] zram: fix possible use after free in zcomp_create() Luis Henriques <luis.henriques@canonical.com> - 2015-09-07 16:20 +0200
        [PATCH v2] zram: fix possible use after free in zcomp_create() Luis Henriques <luis.henriques@canonical.com> - 2015-09-07 16:20 +0200
          Re: [PATCH v2] zram: fix possible use after free in zcomp_create() Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2015-09-08 02:00 +0200
          Re: [PATCH v2] zram: fix possible use after free in zcomp_create() Minchan Kim <minchan@kernel.org> - 2015-09-08 03:10 +0200
            Re: [PATCH v2] zram: fix possible use after free in zcomp_create() Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2015-09-08 03:30 +0200
              Re: [PATCH v2] zram: fix possible use after free in zcomp_create() Minchan Kim <minchan@kernel.org> - 2015-09-08 03:40 +0200
                [PATCH v3] zram: fix possible use after free in zcomp_create() Luis Henriques <luis.henriques@canonical.com> - 2015-09-08 11:40 +0200
                Re: [PATCH v3] zram: fix possible use after free in zcomp_create() Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2015-09-08 12:00 +0200
                Re: [PATCH v3] zram: fix possible use after free in zcomp_create() Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2015-09-08 12:30 +0200
                Re: [PATCH v3] zram: fix possible use after free in zcomp_create() Minchan Kim <minchan@kernel.org> - 2015-09-08 15:40 +0200

csiph-web