Hi,
On Sun, Oct 28, 2012 at 01:09:12AM +0800, Fengguang Wu wrote:
> Hi Nitin,
>
> FYI, there are coccinelle warnings in
>
> tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux master
> head: e657e078d3dfa9f96976db7a2b5fd7d7c9f1f1a6
> commit: c8f2f0db1d0294aaf37e8a85bea9bbc4aaf5c0fe staging: zram: Fix handling of incompressible pages
> date: 5 days ago
>
> + drivers/staging/zram/zram_drv.c:352:8-14: ERROR: reference preceded by free on line 343
I'd like to cite some good comments from Julia:
: I'm not 100% sure whether this is a bug, because the various elements
: are under different conditionals, and I am not sure to understand the
: relationship between them. But I think there is enough of a chance that
: there is a problem for it to be worth contacting the developer.
:
: There is also a problem with the indentation of the kfree, which has too
: many tabs in front of it.
Thanks,
Fengguang
> vim +352 drivers/staging/zram/zram_drv.c
>
> 306b0c95 drivers/staging/ramzswap/ramzswap_drv.c Nitin Gupta 2009-09-22 337
> 924bd88d drivers/staging/zram/zram_drv.c Jerome Marchand 2011-06-10 338 ret = lzo1x_1_compress(uncmem, PAGE_SIZE, src, &clen,
> 8c921b2b drivers/staging/zram/zram_drv.c Jerome Marchand 2011-06-10 339 zram->compress_workmem);
> 306b0c95 drivers/staging/ramzswap/ramzswap_drv.c Nitin Gupta 2009-09-22 340
> ba82fe2e drivers/staging/zram/zram_drv.c Cong Wang 2011-11-25 341 kunmap_atomic(user_mem);
> 924bd88d drivers/staging/zram/zram_drv.c Jerome Marchand 2011-06-10 342 if (is_partial_io(bvec))
> 924bd88d drivers/staging/zram/zram_drv.c Jerome Marchand 2011-06-10 @343 kfree(uncmem);
> 306b0c95 drivers/staging/ramzswap/ramzswap_drv.c Nitin Gupta 2009-09-22 344
> 8c921b2b drivers/staging/zram/zram_drv.c Jerome Marchand 2011-06-10 345 if (unlikely(ret != LZO_E_OK)) {
> 8c921b2b drivers/staging/zram/zram_drv.c Jerome Marchand 2011-06-10 346 pr_err("Compression failed! err=%d\n", ret);
> 924bd88d drivers/staging/zram/zram_drv.c Jerome Marchand 2011-06-10 347 goto out;
> 8c921b2b drivers/staging/zram/zram_drv.c Jerome Marchand 2011-06-10 348 }
> 306b0c95 drivers/staging/ramzswap/ramzswap_drv.c Nitin Gupta 2009-09-22 349
> c8f2f0db drivers/staging/zram/zram_drv.c Nitin Gupta 2012-10-10 350 if (unlikely(clen > max_zpage_size)) {
> 130f315a drivers/staging/zram/zram_drv.c Minchan Kim 2012-06-08 351 zram_stat_inc(&zram->stats.bad_compress);
> c8f2f0db drivers/staging/zram/zram_drv.c Nitin Gupta 2012-10-10 @352 src = uncmem;
> c8f2f0db drivers/staging/zram/zram_drv.c Nitin Gupta 2012-10-10 353 clen = PAGE_SIZE;
> c8f2f0db drivers/staging/zram/zram_drv.c Nitin Gupta 2012-10-10 354 }
> a1dd52af drivers/staging/ramzswap/ramzswap_drv.c Nitin Gupta 2010-06-01 355
>
> ---
> 0-DAY kernel build testing backend Open Source Technology Center
> Fengguang Wu, Yuanhan Liu Intel Corporation
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