Sandipan Das b4d84dcee9 perf report powerpc: Fix crash if callchain is empty ... [ Upstream commit 143c99f6ac ] For some cases, the callchain provided by the kernel may be empty. So, the callchain ip filtering code will cause a crash if we do not check whether the struct ip_callchain pointer is NULL before accessing any members. This can be observed on a powerpc64le system running Fedora 27 as shown below. # perf record -b -e cycles:u ls Before: # perf report --branch-history perf: Segmentation fault -------- backtrace -------- perf[0x1027615c] linux-vdso64.so.1(__kernel_sigtramp_rt64+0x0)[0x7fff856304d8] perf(arch_skip_callchain_idx+0x44)[0x10257c58] perf[0x1017f2e4] perf(thread__resolve_callchain+0x124)[0x1017ff5c] perf(sample__resolve_callchain+0xf0)[0x10172788] ... After: # perf report --branch-history Samples: 25 of event 'cycles:u', Event count (approx.): 2306870 Overhead Source:Line Symbol Shared Object + 11.60% _init+35736 [.] _init ls + 9.84% strcoll_l.c:137 [.] __strcoll_l libc-2.26.so + 9.16% memcpy.S:175 [.] __memcpy_power7 libc-2.26.so + 9.01% gconv_charset.h:54 [.] _nl_find_locale libc-2.26.so + 8.87% dl-addr.c:52 [.] _dl_addr libc-2.26.so + 8.83% _init+236 [.] _init ls ... Reported-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com> Signed-off-by: Sandipan Das <sandipan@linux.ibm.com> Acked-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/20180611104049.11048-1-sandipan@linux.ibm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-08-24 13:09:06 +02:00
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accounting
arch	tools headers: Synchronise x86 cpufeatures.h for L1TF additions	2018-08-15 18:13:01 +02:00
build	tools build: fix # escaping in .cmd files for future Make	2018-07-17 11:39:30 +02:00
cgroup
firewire
gpio	tools/gpio: Fix build error with musl libc	2018-02-03 17:38:47 +01:00
hv	tools: hv: fix compiler warnings about major/target_fname	2018-05-30 07:52:36 +02:00
iio
include	tools: sync up .h files with the repective arch and uapi .h files	2018-05-30 12:19:59 +02:00
kvm/kvm_stat
laptop
leds
lib	tools/lib/subcmd/pager.c: do not alias select() params	2018-05-01 12:58:25 -07:00
net	bpf: fix uninitialized variable in bpf tools	2018-06-21 04:02:49 +09:00
nfsd
objtool	Kbuild: fix # escaping in .cmd files for future Make	2018-07-11 16:29:21 +02:00
pci
pcmcia
perf	perf report powerpc: Fix crash if callchain is empty	2018-08-24 13:09:06 +02:00
power	cpupower : Fix cpupower working when cpu0 is offline	2018-02-03 17:38:55 +01:00
scripts	Kbuild: fix # escaping in .cmd files for future Make	2018-07-11 16:29:21 +02:00
spi
testing	selftests: bpf: notification about privilege required to run test_kmod.sh testing script	2018-08-24 13:09:04 +02:00
thermal/tmon	tools/thermal: tmon: fix for segfault	2018-05-30 07:52:28 +02:00
time
usb	usbip: dynamically allocate idev by nports found in sysfs	2018-08-03 07:50:26 +02:00
virtio
vm
Makefile