| From | Sasha Levin <> | Subject | [PATCH AUTOSEL for 4.15 031/189] tools lib traceevent: Fix get_field_str() for dynamic strings | Date | Mon, 9 Apr 2018 00:17:11 +0000 |
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From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
[ Upstream commit d777f8de99b05d399c0e4e51cdce016f26bd971b ]
If a field is a dynamic string, get_field_str() returned just the offset/size value and not the string. Have it parse the offset/size correctly to return the actual string. Otherwise filtering fails when trying to filter fields that are dynamic strings.
Reported-by: Gopanapalli Pradeep <prap_hai@yahoo.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Acked-by: Namhyung Kim <namhyung@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Link: http://lkml.kernel.org/r/20180112004823.146333275@goodmis.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> --- tools/lib/traceevent/parse-filter.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/tools/lib/traceevent/parse-filter.c b/tools/lib/traceevent/parse-filter.c index 315df0a70265..7b664fd1ebe8 100644 --- a/tools/lib/traceevent/parse-filter.c +++ b/tools/lib/traceevent/parse-filter.c @@ -1879,17 +1879,25 @@ static const char *get_field_str(struct filter_arg *arg, struct pevent_record *r struct pevent *pevent; unsigned long long addr; const char *val = NULL; + unsigned int size; char hex[64]; /* If the field is not a string convert it */ if (arg->str.field->flags & FIELD_IS_STRING) { val = record->data + arg->str.field->offset; + size = arg->str.field->size; + + if (arg->str.field->flags & FIELD_IS_DYNAMIC) { + addr = *(unsigned int *)val; + val = record->data + (addr & 0xffff); + size = addr >> 16; + } /* * We need to copy the data since we can't be sure the field * is null terminated. */ - if (*(val + arg->str.field->size - 1)) { + if (*(val + size - 1)) { /* copy it */ memcpy(arg->str.buffer, val, arg->str.field->size); /* the buffer is already NULL terminated */ -- 2.15.1
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