zram: avoid double free in function zram_bvec_write()

commit 65c484609a3b25c35e4edcd5f2c38f98f5226093 upstream.

When doing a patial write and the whole page is filled with zero,
zram_bvec_write() will free uncmem twice.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c
index 2ca6dc9a593e2a9312b38dfaa2843769283cbcab..27ab8241deb9cc321400c4a810a98e7a7304c2ee 100644 (file)
--- a/drivers/staging/zram/zram_drv.c
+++ b/drivers/staging/zram/zram_drv.c
@@ -272,8 +272,6 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
 
        if (page_zero_filled(uncmem)) {
                kunmap_atomic(user_mem);
-               if (is_partial_io(bvec))
-                       kfree(uncmem);
                zram->stats.pages_zero++;
                zram_set_flag(meta, index, ZRAM_ZERO);
                ret = 0;