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Check for NULL pointer in mifare_application_free()

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This changeset alters the return type of mifare_application_free() from void to
int. This change is necessary to be able to inform the caller whether the call
to malloc() inside mifare_application_find() failed.
This commit is contained in:
Robert Clausecker 2014-03-19 17:04:14 +01:00 committed by Philippe Teuwen
parent c4e657f8cd
commit 3e53c7811a
2 changed files with 8 additions and 2 deletions
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2
libfreefare/freefare.h
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@ -171,7 +171,7 @@ void mad_free (Mad mad);
MifareClassicSectorNumber *mifare_application_alloc (Mad mad, const MadAid aid, const size_t size);
ssize_t mifare_application_read (MifareTag tag, Mad mad, const MadAid aid, void *buf, size_t nbytes, const MifareClassicKey key, const MifareClassicKeyType key_type);
ssize_t mifare_application_write (MifareTag tag, Mad mad, const MadAid aid, const void *buf, size_t nbytes, const MifareClassicKey key, const MifareClassicKeyType key_type);
void mifare_application_free (Mad mad, const MadAid aid);
int mifare_application_free (Mad mad, const MadAid aid);
MifareClassicSectorNumber *mifare_application_find (Mad mad, const MadAid aid);

8
libfreefare/mifare_application.c
View file

@ -158,18 +158,24 @@ mifare_application_alloc (Mad mad, MadAid aid, size_t size)
/*
* Remove an application from a MAD.
*/
void
int
mifare_application_free (Mad mad, MadAid aid)
{
MifareClassicSectorNumber *sectors = mifare_application_find (mad, aid);
MifareClassicSectorNumber *p = sectors;
MadAid free_aid = { 0x00, 0x00 };
/* figure out if malloc() in mifare_application_find() failed */
if (sectors == NULL) return count_aids (mad, aid) ? -1 : 0;
while (*p) {
mad_set_aid (mad, *p, free_aid);
p++;
}
free (sectors);
return 0;
}