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libdm: add missing error handling in _stats_parse_histogram()

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Since we are growing an object in the histogram pool the return
value of dm_pool_grow_object() must be checked and error paths need
to abandon the object before returning.
This commit is contained in:
Bryn M. Reeves 2015-09-07 11:44:53 +01:00
parent a26523330e
commit 36b09fd147
1 changed files with 12 additions and 13 deletions
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25
libdm/libdm-stats.c
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@ -721,22 +721,20 @@ static int _stats_parse_histogram(struct dm_pool *mem, char *hist_str,
hist.nr_bins = nr_bins;
dm_pool_grow_object(mem, &hist, sizeof(hist));
if (!dm_pool_grow_object(mem, &hist, sizeof(hist)))
goto_bad;
do {
memset(&cur, 0, sizeof(cur));
for (v = _valid_chars; *v; v++)
if (*c == *v)
break;
if (!*v) {
stack;
if (!*v)
goto badchar;
}
if (*c == ',') {
log_error("Invalid histogram: %s", hist_str);
return 0;
} else {
if (*c == ',')
goto badchar;
else {
const char *val_start = c;
char *endptr = NULL;
uint64_t this_val = 0;
@ -744,17 +742,15 @@ static int _stats_parse_histogram(struct dm_pool *mem, char *hist_str,
this_val = strtoull(val_start, &endptr, 10);
if (!endptr) {
log_error("Could not parse histogram value.");
return 0;
goto bad;
}
c = endptr; /* Advance to colon, or end. */
if (*c == ':')
c++;
else if (*c & (*c != '\n')) {
else if (*c & (*c != '\n'))
/* Expected ':', '\n', or NULL. */
stack;
goto badchar;
}
if (*c == ':')
c++;
@ -763,7 +759,8 @@ static int _stats_parse_histogram(struct dm_pool *mem, char *hist_str,
cur.count = this_val;
sum += this_val;
dm_pool_grow_object(mem, &cur, sizeof(cur));
if (!dm_pool_grow_object(mem, &cur, sizeof(cur)))
goto_bad;
bin++;
}
@ -778,6 +775,8 @@ static int _stats_parse_histogram(struct dm_pool *mem, char *hist_str,
badchar:
log_error("Invalid character in histogram data: '%c' (0x%x)", *c, *c);
bad:
dm_pool_abandon_object(mem);
return 0;
}