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tools lib traceevent: Handle dynamic array's element size properly 

Fixing the dynamic array format field parsing.

Currently the event_read_fields function could segfault while parsing
dynamic array other than string type. The reason is the event->pevent
does not need to be set and gets dereferenced unconditionaly.

Also adding proper initialization of field->elementsize based on the
parsed dynamic type.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1359060403-32422-1-git-send-email-jolsa@redhat.com
[ committer note: Made a char pointer parameter const, as requested by Steven ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2013-01-24 21:46:43 +01:00 committed by Arnaldo Carvalho de Melo
parent a2d28d0c19
commit e23c1a5578
1 changed files with 37 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
tools/lib/traceevent/event-parse.c
View File

@ -1223,6 +1223,34 @@ static int field_is_long(struct format_field *field)
return 0;
}
static unsigned int type_size(const char *name)
{
/* This covers all FIELD_IS_STRING types. */
static struct {
const char *type;
unsigned int size;
} table[] = {
{ "u8", 1 },
{ "u16", 2 },
{ "u32", 4 },
{ "u64", 8 },
{ "s8", 1 },
{ "s16", 2 },
{ "s32", 4 },
{ "s64", 8 },
{ "char", 1 },
{ },
};
int i;
for (i = 0; table[i].type; i++) {
if (!strcmp(table[i].type, name))
return table[i].size;
}
return 0;
}
static int event_read_fields(struct event_format *event, struct format_field **fields)
{
struct format_field *field = NULL;
@ -1232,6 +1260,8 @@ static int event_read_fields(struct event_format *event, struct format_field **f
int count = 0;
do {
unsigned int size_dynamic = 0;
type = read_token(&token);
if (type == EVENT_NEWLINE) {
free_token(token);
@ -1390,6 +1420,7 @@ static int event_read_fields(struct event_format *event, struct format_field **f
field->type = new_type;
strcat(field->type, " ");
strcat(field->type, field->name);
size_dynamic = type_size(field->name);
free_token(field->name);
strcat(field->type, brackets);
field->name = token;
@ -1478,10 +1509,14 @@ static int event_read_fields(struct event_format *event, struct format_field **f
if (field->flags & FIELD_IS_ARRAY) {
if (field->arraylen)
field->elementsize = field->size / field->arraylen;
else if (field->flags & FIELD_IS_DYNAMIC)
field->elementsize = size_dynamic;
else if (field->flags & FIELD_IS_STRING)
field->elementsize = 1;
else
field->elementsize = event->pevent->long_size;
else if (field->flags & FIELD_IS_LONG)
field->elementsize = event->pevent ?
event->pevent->long_size :
sizeof(long);
} else
field->elementsize = field->size;