| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.0 051/220] mmc: tmio: Remove bogus un-initialization in tmio_mmc_host_free() | Date | Sat, 2 May 2015 20:59:26 +0200 |
| |
4.0-stable review patch. If anyone has any objections, please let me know.
------------------
From: Geert Uytterhoeven <geert+renesas@glider.be>
commit 13a6a2ed1f5e77ae47c2b1a8e3bf22b2fa2d56ba upstream.
If CONFIG_DEBUG_SLAB=y:
sh_mobile_sdhi ee100000.sd: Got CD GPIO sh_mobile_sdhi ee100000.sd: Got WP GPIO platform ee100000.sd: Driver sh_mobile_sdhi requests probe deferral ... Slab corruption (Not tainted): kmalloc-1024 start=ed8b3c00, len=1024 2d0: 00 00 00 00 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b ....kkkkkkkkkkkk Prev obj: start=ed8b3800, len=1024 000: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk 010: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Struct tmio_mmc_host is embedded inside struct mmc_host, and thus is freed by the call to mmc_free_host(). Hence it must not be written to afterwards, as that will corrupt freed (and perhaps already reused) memory.
Fixes: 94b110aff8679b14 ("mmc: tmio: add tmio_mmc_host_alloc/free()") Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/mmc/host/tmio_mmc_pio.c | 2 -- 1 file changed, 2 deletions(-)
--- a/drivers/mmc/host/tmio_mmc_pio.c +++ b/drivers/mmc/host/tmio_mmc_pio.c @@ -1073,8 +1073,6 @@ EXPORT_SYMBOL(tmio_mmc_host_alloc); void tmio_mmc_host_free(struct tmio_mmc_host *host) { mmc_free_host(host->mmc); - - host->mmc = NULL; } EXPORT_SYMBOL(tmio_mmc_host_free);
|