xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

perf probe: Fix a bug that --line range can be overflow

Browse Source 
Since line_finder.lno_s/e are signed int but line_range.start/end
are unsigned int, it is possible to be overflow when converting
line_range->start/end to line_finder->lno_s/e.
This changes line_range.start/end and line_list.line to signed int
and adds overflow checks when setting line_finder.lno_s/e.

LKML-Reference: <20100414223942.14630.72730.stgit@localhost6.localdomain6>
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Masami Hiramatsu
2010-04-14 18:39:42 -04:00
committed by Arnaldo Carvalho de Melo
parent dd259c5db2
commit d3b63d7ae0
3 changed files with 24 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
tools/perf/util/probe-finder.c
View File

@@ -111,7 +111,7 @@ static int strtailcmp(const char *s1, const char *s2)
/* Line number list operations */
/* Add a line to line number list */
static int line_list__add_line(struct list_head *head, unsigned int line)
static int line_list__add_line(struct list_head *head, int line)
{
struct line_node *ln;
struct list_head *p;
@@ -138,7 +138,7 @@ found:
}
/* Check if the line in line number list */
static int line_list__has_line(struct list_head *head, unsigned int line)
static int line_list__has_line(struct list_head *head, int line)
{
struct line_node *ln;
@@ -1146,7 +1146,7 @@ static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf)
if (lf->lr->path == NULL)
return -ENOMEM;
}
line_list__add_line(&lf->lr->line_list, (unsigned int)lineno);
line_list__add_line(&lf->lr->line_list, lineno);
}
/* Update status */
if (!list_empty(&lf->lr->line_list))
@@ -1179,10 +1179,12 @@ static int line_range_search_cb(Dwarf_Die *sp_die, void *data)
dwarf_decl_line(sp_die, &lr->offset);
pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset);
lf->lno_s = lr->offset + lr->start;
if (!lr->end)
if (lf->lno_s < 0) /* Overflow */
lf->lno_s = INT_MAX;
lf->lno_e = lr->offset + lr->end;
if (lf->lno_e < 0) /* Overflow */
lf->lno_e = INT_MAX;
else
lf->lno_e = lr->offset + lr->end;
pr_debug("New line range: %d to %d\n", lf->lno_s, lf->lno_e);
lr->start = lf->lno_s;
lr->end = lf->lno_e;
if (dwarf_func_inline(sp_die)) {
@@ -1244,10 +1246,7 @@ int find_line_range(int fd, struct line_range *lr)
ret = find_line_range_by_func(&lf);
else {
lf.lno_s = lr->start;
if (!lr->end)
lf.lno_e = INT_MAX;
else
lf.lno_e = lr->end;
lf.lno_e = lr->end;
ret = find_line_range_by_line(NULL, &lf);
}
}