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| author |   Sergey Senozhatsky <sergey.senozhatsky@gmail.com> | 2013-06-26 15:28:39 +0300 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-07-23 15:08:50 -0700 |
| commit | 644d478793c6594277f8ae76954da4ace7ac6f96 (patch) | |
| tree | 150a2be39c9914953a83fcc7e4f2f0c4274290b2 /drivers/staging | |
| parent | staging: gdm72xx: potential use after free in send_qos_list() (diff) | |
| download | linux-dev-644d478793c6594277f8ae76954da4ace7ac6f96.tar.xz linux-dev-644d478793c6594277f8ae76954da4ace7ac6f96.zip | |
staging: zram: protect zram_reset_device() call
Commit 9b3bb7abcdf2df0f1b2657e6cbc9d06bc2b3b36f (remove
zram_sysfs file (v2)) accidentally made zram_reset_device()
racy. Protect zram_reset_device() call with zram->lock.
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Jerome Marchand <jmarchand@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/zram/zram_drv.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c index 82c7202fd5cc..e77fb6ea40c9 100644 --- a/drivers/staging/zram/zram_drv.c +++ b/drivers/staging/zram/zram_drv.c @@ -527,8 +527,11 @@ static void zram_reset_device(struct zram *zram) size_t index; struct zram_meta *meta; - if (!zram->init_done) + down_write(&zram->init_lock); + if (!zram->init_done) { + up_write(&zram->init_lock); return; + } meta = zram->meta; zram->init_done = 0; @@ -549,6 +552,7 @@ static void zram_reset_device(struct zram *zram) zram->disksize = 0; set_capacity(zram->disk, 0); + up_write(&zram->init_lock); } static void zram_init_device(struct zram *zram, struct zram_meta *meta) |