Commit-ID: e23c1a5578cf32ed3a7ac9dde59a2de0a52ff812 Gitweb: http://git.kernel.org/tip/e23c1a5578cf32ed3a7ac9dde59a2de0a52ff812 Author: Jiri Olsa <jo...@redhat.com> AuthorDate: Thu, 24 Jan 2013 21:46:43 +0100 Committer: Arnaldo Carvalho de Melo <a...@redhat.com> CommitDate: Fri, 25 Jan 2013 12:49:28 -0300
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 <jo...@redhat.com> Acked-by: Steven Rostedt <rost...@goodmis.org> Cc: Corey Ashford <cjash...@linux.vnet.ibm.com> Cc: Frederic Weisbecker <fweis...@gmail.com> Cc: Ingo Molnar <mi...@elte.hu> Cc: Namhyung Kim <namhy...@kernel.org> Cc: Paul Mackerras <pau...@samba.org> Cc: Peter Zijlstra <a.p.zijls...@chello.nl> Cc: Steven Rostedt <rost...@goodmis.org> Link: http://lkml.kernel.org/r/1359060403-32422-1-git-send-email-jo...@redhat.com [ committer note: Made a char pointer parameter const, as requested by Steven ] Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com> --- tools/lib/traceevent/event-parse.c | 39 ++++++++++++++++++++++++++++++++++++-- 1 file changed, 37 insertions(+), 2 deletions(-) diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c index bb8b3db..82b0606 100644 --- a/tools/lib/traceevent/event-parse.c +++ b/tools/lib/traceevent/event-parse.c @@ -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; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
