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fix memory leak in z_declare_subscriber #262

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merged 5 commits into from
Oct 18, 2023
Merged

fix memory leak in z_declare_subscriber #262

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0c24769
fix memory leak in z_declare_subscriber
p-avital Oct 12, 2023
0c9a871
Merge branch 'master' into fix-259
cguimaraes Oct 12, 2023
d421206
Update zenohpico.pc
cguimaraes Oct 12, 2023
19e694f
check the malloc
p-avital Oct 13, 2023
db2ac4c
cancel prefix declaration if allocating suffix failed in subscriber d…
p-avital Oct 17, 2023
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10 changes: 6 additions & 4 deletions src/api/api.c
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Original file line number Diff line number Diff line change
Expand Up @@ -826,10 +826,12 @@ z_owned_subscriber_t z_declare_subscriber(z_session_t zs, z_keyexpr_t keyexpr, z
wild -= 1;
size_t len = wild - keyexpr._suffix;
suffix = z_malloc(len + 1);
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memcpy(suffix, keyexpr._suffix, len);
suffix[len] = 0;
keyexpr._suffix = suffix;
_z_keyexpr_set_owns_suffix(&keyexpr, false);
if (suffix != NULL) {
memcpy(suffix, keyexpr._suffix, len);
suffix[len] = 0;
keyexpr._suffix = suffix;
_z_keyexpr_set_owns_suffix(&keyexpr, false);
}
}
uint16_t id = _z_declare_resource(zs._val, keyexpr);
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What is declared if suffix allocation fails? It seems that it will declare a keyexpr with id but no suffix...

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It will declare the exact keyexpr that was passed to the subscriber, but will keep the wild suffix, so the bug is not the one you expected, but it is buggy

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Actually was a bug, but not the one you expected. Let's just cancel attempting to declare the resource if we failed to allocate for the suffix, the other steps would probably also fail anyway.

key = _z_rid_with_suffix(id, wild);
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