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author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2011-01-10 21:37:57 -0200 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2011-01-10 22:23:08 -0200 |
commit | 3d03e2ea74103a50c23d6ab1906cf73399c0dafb (patch) | |
tree | 788261677d4fe58101a6d88ae02a3bc870b86141 /arch/arm/kernel/machine_kexec.c | |
parent | 0252208eb52f6fe8731a47804eddc7ba93f60a87 (diff) | |
download | blackbird-op-linux-3d03e2ea74103a50c23d6ab1906cf73399c0dafb.tar.gz blackbird-op-linux-3d03e2ea74103a50c23d6ab1906cf73399c0dafb.zip |
perf session: Fix infinite loop in __perf_session__process_events
In this if statement:
if (head + event->header.size >= mmap_size) {
if (mmaps[map_idx]) {
munmap(mmaps[map_idx], mmap_size);
mmaps[map_idx] = NULL;
}
page_offset = page_size * (head / page_size);
file_offset += page_offset;
head -= page_offset;
goto remap;
}
With, for instance, these values:
head=2992
event->header.size=48
mmap_size=3040
We end up endlessly looping back to remap. Off by one.
Problem introduced in 55b4462.
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Reported-by: Ingo Molnar <mingo@elte.hu>
Reported-by: David Ahern <daahern@cisco.com>
Bisected-by: David Ahern <daahern@cisco.com>
Tested-by: David Ahern <daahern@cisco.com>
Cc: David Ahern <daahern@cisco.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'arch/arm/kernel/machine_kexec.c')
0 files changed, 0 insertions, 0 deletions