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Cleanup: fix memory management of the plot data

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There was a global variable last_pi_entry_new, which stored the
recently allocated plot data. This was freed when new plot data
was generated.

A very scary proposition: You can never have two plot datas at
the same time! But exactly that happens when you export for
example subtitles.

The only reason why this didn't lead to very crazy behavior
is that at least on my Linux machine, the calloc() call would
just return the previously freed memory.

Fix this mess by removing the global variable and freeing the
data in the callers.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2019-07-06 14:41:09 +02:00 • committed by Dirk Hohndel
parent 5e9ffe3005
commit 69be1e23f2
4 changed files with 16 additions and 11 deletions
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20
core/profile.c
View file

@ -31,8 +31,6 @@ extern int ascent_velocity(int depth, int avg_depth, int bottom_time);
struct dive *current_dive = NULL;
unsigned int dc_number = 0;
static struct plot_data *last_pi_entry_new = NULL;
#ifdef DEBUG_PI
/* debugging tool - not normally used */
static void dump_pi(struct plot_info *pi)
@ -507,7 +505,13 @@ struct plot_info calculate_max_limits_new(struct dive *dive, struct divecomputer
entry++; \
idx++
struct plot_data *populate_plot_entries(struct dive *dive, struct divecomputer *dc, struct plot_info *pi)
void free_plot_info_data(struct plot_info *pi)
{
free(pi->entry);
pi->entry = NULL;
}
static void populate_plot_entries(struct dive *dive, struct divecomputer *dc, struct plot_info *pi)
{
UNUSED(dive);
int idx, maxtime, nr, i;
@ -529,7 +533,7 @@ struct plot_data *populate_plot_entries(struct dive *dive, struct divecomputer *
plot_data = calloc(nr, sizeof(struct plot_data));
pi->entry = plot_data;
if (!plot_data)
return NULL;
return;
pi->nr = nr;
idx = 2; /* the two extra events at the start */
@ -634,8 +638,6 @@ struct plot_data *populate_plot_entries(struct dive *dive, struct divecomputer *
plot_data[idx++].sec = lasttime + 1;
plot_data[idx++].sec = lasttime + 2;
pi->nr = idx;
return plot_data;
}
#undef INSERT_ENTRY
@ -1334,9 +1336,7 @@ void create_plot_info_new(struct dive *dive, struct divecomputer *dc, struct plo
#else
UNUSED(planner_ds);
#endif
/* Create the new plot data */
free((void *)last_pi_entry_new);
free_plot_info_data(pi);
get_dive_gas(dive, &o2, &he, &o2max);
if (dc->divemode == FREEDIVE){
pi->dive_type = FREEDIVE;
@ -1349,7 +1349,7 @@ void create_plot_info_new(struct dive *dive, struct divecomputer *dc, struct plo
pi->dive_type = AIR;
}
last_pi_entry_new = populate_plot_entries(dive, dc, pi);
populate_plot_entries(dive, dc, pi);
check_setpoint_events(dive, dc, pi); /* Populate setpoints */
setup_gas_sensor_pressure(dive, dc, pi); /* Try to populate our gas pressure knowledge */