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: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Reported-by: default avatarIngo Molnar <mingo@elte.hu>
Reported-by: default avatarDavid Ahern <daahern@cisco.com>
Bisected-by: default avatarDavid Ahern <daahern@cisco.com>
Tested-by: default avatarDavid 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 0252208e
...@@ -1007,7 +1007,7 @@ int __perf_session__process_events(struct perf_session *session, ...@@ -1007,7 +1007,7 @@ int __perf_session__process_events(struct perf_session *session,
if (size == 0) if (size == 0)
size = 8; size = 8;
if (head + event->header.size >= mmap_size) { if (head + event->header.size > mmap_size) {
if (mmaps[map_idx]) { if (mmaps[map_idx]) {
munmap(mmaps[map_idx], mmap_size); munmap(mmaps[map_idx], mmap_size);
mmaps[map_idx] = NULL; mmaps[map_idx] = NULL;
......
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