28 Feb
2012
28 Feb
'12
9:24 p.m.
You pass the value of a pointer, not the address of a pointer and
therefore it cannot be set to NULL.
You need to check if the shm_malloc is successful and before calling
shm_free, you should check the value of the pointer.
Also, it is always good to set the pointer to NULL after a shm_free to
avoid dangling pointers.
Regards,
Ovidiu Sas
On Tue, Feb 28, 2012 at 2:14 PM, Iñaki Baz Castillo <ibc(a)aliax.net> wrote:
Hi, I'm realizing that a doble freeing occurs in
regex module when it
fails to start due to module params errors. But I'm sure it didn't
occur in Kamailio 1.5. My question is the following:
static int *number;
number = shm_malloc(sizeof(int));
shm_free(number);
Should now number be NULL? I confirm that it's NOT, so I get a double
freeing since the function free_shared_memory() is executed twice and
I check "if (number)" before doing "shm_free(number)".
So is it a change in 3.X? should I write:
shm_free(number);
number = NULL;
?
Thanks a lot.
--
Iñaki Baz Castillo
<ibc(a)aliax.net>
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