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Check error code of get_cylider_idx_by_use()

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If not cylinder with type DILUENT or OXYGEN is defined, this function
returns -1 which should not be used as an index to an array. This
patch adds code to check for this return value and exit gracefully.

On line I marked with a comment. Someone more knowledgeable of that part of
code than me should double check that return is here what we want.

[Dirk Hohndel: fixed small oversight...]

Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Robert C. Helling 2014-11-22 21:07:57 +01:00 • committed by Dirk Hohndel
parent 38bbed978a
commit 13934b0f02
3 changed files with 11 additions and 2 deletions
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5
gaspressures.c
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@ -271,6 +271,8 @@ static void fill_missing_tank_pressures(struct dive *dive, struct plot_info *pi,
if (o2_flag) {
// Find the cylinder index (cyl) and pressure
cyl = dive->oxygen_cylinder_index;
if (cyl < 0)
return; // Can we do this?!?
pressure = O2CYLINDER_PRESSURE(entry);
save_pressure = &(entry->o2cylinderpressure[SENSOR_PR]);
save_interpolated = &(entry->o2cylinderpressure[INTERPOLATED_PR]);
@ -374,6 +376,8 @@ void populate_pressure_information(struct dive *dive, struct divecomputer *dc, s
if (o2_flag) { // if this is a diluent cylinder:
pressure = O2CYLINDER_PRESSURE(entry);
cylinderid = dive->oxygen_cylinder_index;
if (cylinderid < 0)
goto GIVE_UP;
} else {
pressure = SENSOR_PRESSURE(entry);
cylinderid = entry->cylinderindex;
@ -424,6 +428,7 @@ void populate_pressure_information(struct dive *dive, struct divecomputer *dc, s
debug_print_pressures(pi);
#endif
GIVE_UP:
for (i = 0; i < MAX_CYLINDERS; i++)
list_free(track_pr[i]);
}