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linux/drivers/char/hw_random
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Michael Büsch 837bf7cc3b hwrng: core - Always drop the RNG in hwrng_unregister() 
enable_best_rng() is used in hwrng_unregister() to switch away from the
currently active RNG, if that is the one currently being removed.
However enable_best_rng() might fail, if the next RNG's init routine
fails. In that case enable_best_rng() will return an error code and
the currently active RNG will remain active.
After unregistering this might lead to crashes due to use-after-free.

Fix this by dropping the currently active RNG, if enable_best_rng()
failed. This will result in no RNG to be active, if the next-best
one failed to initialize.

This problem was introduced by 142a27f0a7

Fixes: 142a27f0a7 ("hwrng: core - Reset user selected rng by...")
Reported-by: Wirz <spam@lukas-wirz.de>
Tested-by: Wirz <spam@lukas-wirz.de>
Signed-off-by: Michael Büsch <m@bues.ch>
Cc: stable@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2018-06-15 23:06:49 +08:00
..
amd-rng.c hwrng: amd - Revert managed API changes 2017-03-16 17:43:10 +08:00
atmel-rng.c hwrng: atmel - use clk_disable_unprepare instead of clk_disable 2016-11-17 23:34:57 +08:00
bcm2835-rng.c hwrng: bcm2835 - Handle deferred clock properly 2018-02-22 22:16:21 +08:00
cavium-rng-vf.c hwrng: cavium - make two functions static 2018-03-09 22:45:34 +08:00
cavium-rng.c hwrng: cavium - make two functions static 2018-03-09 22:45:34 +08:00
core.c hwrng: core - Always drop the RNG in hwrng_unregister() 2018-06-15 23:06:49 +08:00
exynos-trng.c hwrng: exynos - remove redundant dev_err call in exynos_trng_probe() 2018-01-18 22:52:26 +11:00
geode-rng.c hwrng: geode - Revert managed API changes 2017-03-16 17:43:11 +08:00
hisi-rng.c hwrng: hisi - Add support for Hisilicon SoC RNG 2016-04-15 22:36:36 +08:00
imx-rngc.c hwrng: imx-rngc - make symbol imx_rngc_pm_ops static 2018-02-15 23:26:44 +08:00
intel-rng.c hwrng: printk replacement 2014-10-02 14:35:00 +08:00
iproc-rng200.c hwrng: iproc-rng200 - Add support for BCM7278 2017-11-10 19:20:12 +08:00
ixp4xx-rng.c IXP4xx: HW pseudo-random generator is available on IXP45x/46x only. 2012-11-22 03:35:39 +00:00
Kconfig hwrng: stm32 - define default state for rng driver 2018-05-05 14:52:47 +08:00
ks-sa-rng.c hwrng: ks-sa - add hw_random driver 2018-03-23 23:40:08 +08:00
Makefile hwrng: ks-sa - add hw_random driver 2018-03-23 23:40:08 +08:00
meson-rng.c hwrng: meson - add clock handling to driver 2017-03-16 17:58:49 +08:00
msm-rng.c hwrng: Make explicit that max >= 32 always 2016-11-21 22:50:45 +08:00
mtk-rng.c hwrng: mediatek - Setup default RNG quality 2018-01-18 22:52:25 +11:00
mxc-rnga.c hwrng: mxc-rnga - add driver support on boards with device tree 2018-03-16 23:35:44 +08:00
n2-asm.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
n2-drv.c hwrng: n2 - fix spelling mistake: "restesting" -> "retesting" 2018-05-19 00:13:53 +08:00
n2rng.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
nomadik-rng.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2014-04-03 09:28:16 -07:00
octeon-rng.c hwrng: octeon - Use devm_hwrng_register 2015-09-21 22:00:38 +08:00
omap3-rom-rng.c hwrng: omap3-rom - Handle return value of clk_prepare_enable 2017-05-23 12:52:03 +08:00
omap-rng.c hwrng: omap - Fix clock resource by adding a register clock 2018-03-09 22:45:45 +08:00
pasemi-rng.c hwrng: pasemi - Use linux/io.h instead of asm/io.h 2016-09-13 20:27:21 +08:00
pic32-rng.c hwrng: Make explicit that max >= 32 always 2016-11-21 22:50:45 +08:00
powernv-rng.c char: constify of_device_id array 2015-03-16 21:10:28 +01:00
pseries-rng.c hwrng: pseries - constify vio_device_id 2017-09-22 17:43:05 +08:00
s390-trng.c s390/trng: Introduce s390 TRNG device driver. 2017-04-26 13:41:36 +02:00
st-rng.c hwrng: st - Fix missing clk_disable_unprepare() on error in st_rng_probe() 2016-09-13 20:27:24 +08:00
stm32-rng.c hwrng: stm32 - fix pm_suspend issue 2018-05-05 14:52:49 +08:00
timeriomem-rng.c hwrng: timeriomem - Remove 'max < 4' condition check 2017-09-22 17:43:14 +08:00
tx4939-rng.c hwrng: tx4939 - Use devm_hwrng_register instead of hwrng_register 2016-08-31 23:00:49 +08:00
via-rng.c hwrng: via - support new Centaur CPU 2018-04-21 00:59:03 +08:00
virtio-rng.c hwrng: virtio - Virtio RNG devices need to be re-registered after suspend/resume 2017-11-06 14:45:06 +08:00
xgene-rng.c hwrng: xgene - Convert timers to use timer_setup() 2017-11-03 22:11:16 +08:00