# git rev-parse -q --verify 837bf7cc3b7504385ae0e829c72e470dfc27cf6c^{commit}
# git fetch -q -n -f git://fs.ozlabs.ibm.com/kernel/crypto master
# git rev-parse -q --verify 837bf7cc3b7504385ae0e829c72e470dfc27cf6c^{commit}
837bf7cc3b7504385ae0e829c72e470dfc27cf6c
# git checkout -q -f -B kisskb 837bf7cc3b7504385ae0e829c72e470dfc27cf6c
# git clean -qxdf
# < git log -1
# commit 837bf7cc3b7504385ae0e829c72e470dfc27cf6c
# Author: Michael Büsch <m@bues.ch>
# Date:   Thu Jun 14 20:08:11 2018 +0200
# 
#     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 142a27f0a731ddcf467546960a5585970ca98e21
#     
#     Fixes: 142a27f0a731 ("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>
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-gcc --version
# < git log --format=%s --max-count=1 837bf7cc3b7504385ae0e829c72e470dfc27cf6c
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/crypto_pmac32_defconfig_powerpc CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  pmac32_defconfig
# make -s -j 48 ARCH=powerpc O=/kisskb/build/crypto_pmac32_defconfig_powerpc CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:183:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/base/regmap/regmap.c: In function 'regmap_raw_read':
/kisskb/src/drivers/base/regmap/regmap.c:2497:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/base/regmap/regmap.c: In function '_regmap_raw_write':
/kisskb/src/drivers/base/regmap/regmap.c:1819:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/dma-buf/reservation.c: In function 'reservation_object_add_shared_fence':
/kisskb/src/drivers/dma-buf/reservation.c:225:6: warning: 'k' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/sound/ppc/awacs.c: In function 'snd_pmac_awacs_init':
/kisskb/src/include/sound/control.h:220:2: warning: 'speaker_vol' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/sound/ppc/awacs.c:886:36: note: 'speaker_vol' was declared here
/kisskb/src/fs/proc/inode.c: In function 'proc_reg_open':
/kisskb/src/include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/proc/inode.c:340:21: note: 'pdeo' was declared here
/kisskb/src/net/mac80211/mlme.c: In function 'ieee80211_rx_mgmt_beacon':
/kisskb/src/net/mac80211/mlme.c:1352:3: warning: 'pwr_level_cisco' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/mac80211/mlme.c:1309:6: note: 'pwr_level_cisco' was declared here
/kisskb/src/drivers/tty/serial/8250/8250_core.c: In function 'univ8250_release_irq':
/kisskb/src/drivers/tty/serial/8250/8250_core.c:251:18: warning: 'i' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/tty/serial/8250/8250_core.c:231:19: note: 'i' was declared here
/kisskb/src/fs/nfsd/nfs4xdr.c: In function 'nfsd4_encode_components_esc':
/kisskb/src/fs/nfsd/nfs4xdr.c:2041:9: warning: 'str' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/net/tun.c: In function 'tun_get_user':
/kisskb/src/drivers/net/tun.c:1827:30: warning: 'copylen' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/net/tun.c:1737:46: warning: 'linear' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/net/wireless/broadcom/b43/phy_n.c: In function 'b43_nphy_rf_ctl_override_rev7':
/kisskb/src/drivers/net/wireless/broadcom/b43/phy_n.c:202:21: warning: 'val_addr' may be used uninitialized in this function [-Wuninitialized]
INFO: Uncompressed kernel (size 0x89c2c4) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x900000)
Completed OK
# rm -rf /kisskb/build/crypto_pmac32_defconfig_powerpc
# Build took: 0:01:20.364966