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libthread_db: unsign map_len and use reallocarray(3).

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Lengths are not negative, so map_len should be unsigned. Unsign the
corresponding indexes too and bring a small use of reallocarray(3).

Reorder the memset to be consistent with the realloc: it appears we
were only clearing half the memory in pt_map_thread().

MFC after:	2 weeks
This commit is contained in:
Pedro F. Giffuni 2017-04-20 17:43:25 +00:00
parent 2d445fb18c
commit 1f2b051d84
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=317200
2 changed files with 8 additions and 7 deletions
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13
lib/libthread_db/libpthread_db.c
View file

@ -74,7 +74,8 @@ pt_map_thread(const td_thragent_t *const_ta, psaddr_t pt, enum pt_type type)
{
td_thragent_t *ta = __DECONST(td_thragent_t *, const_ta);
struct pt_map *new;
int i, first = -1;
int first = -1;
unsigned int i;
/* leave zero out */
for (i = 1; i < ta->map_len; ++i) {
@ -94,12 +95,12 @@ pt_map_thread(const td_thragent_t *const_ta, psaddr_t pt, enum pt_type type)
ta->map_len = 20;
first = 1;
} else {
new = realloc(ta->map,
sizeof(struct pt_map) * ta->map_len * 2);
new = reallocarray(ta->map, ta->map_len,
2 * sizeof(struct pt_map));
if (new == NULL)
return (-1);
memset(new + ta->map_len, '\0', sizeof(struct pt_map) *
ta->map_len);
memset(new + ta->map_len, '\0', ta->map_len *
2 * sizeof(struct pt_map));
first = ta->map_len;
ta->map = new;
ta->map_len *= 2;
@ -1047,7 +1048,7 @@ pt_thr_sstep(const td_thrhandle_t *th, int step)
static void
pt_unmap_lwp(const td_thragent_t *ta, lwpid_t lwp)
{
int i;
unsigned int i;
for (i = 0; i < ta->map_len; ++i) {
if (ta->map[i].type == PT_LWP && ta->map[i].lwp == lwp) {

2
lib/libthread_db/libpthread_db.h
View file

@ -77,7 +77,7 @@ struct td_thragent {
int thread_off_sigmask;
int thread_off_sigpend;
struct pt_map *map;
int map_len;
unsigned int map_len;
};
void pt_md_init(void);