On 2/26/2017 9:37 PM, Cy Schubert wrote:
In message <404d743b-735b-0605-5ab5-ccb95ce24...@freebsd.org>, Pedro
Giffuni wr
ites:
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Hello;
On 2/26/2017 8:51 PM, Cy Schubert wrote:
In message <201702270010.v1r0a1wm074...@repo.freebsd.org>, "Pedro F.
Giffuni" w
rites:
Author: pfg
Date: Mon Feb 27 00:10:00 2017
New Revision: 314322
URL: https://svnweb.freebsd.org/changeset/base/314322
Log:
librss: simplify some NULL checks.
MFC after: 1 week
Modified:
head/lib/librss/librss.c
Modified: head/lib/librss/librss.c
==========================================================================
===
=
--- head/lib/librss/librss.c Sun Feb 26 22:17:06 2017 (r31432
1)
+++ head/lib/librss/librss.c Mon Feb 27 00:10:00 2017 (r31432
2)
@@ -244,10 +244,10 @@ rss_config_get(void)
return (rc);
error:
- if ((rc != NULL) && rc->rss_bucket_map)
+ if (rc != NULL) {
free(rc->rss_bucket_map);
What happens if rc is not NULL and rc->rss_bucket_map is NULL?
According the free(3): " If /ptr/ is *NULL*, no action occurs."
Good point.
Then why even test for RC being NULL?
If rc is NULL, there is a chance that rc->rss_bucket_map is random
garbage and you might be "double freeing" something.
The only reason I can think of doing any test for NULL before free(3) is
that if the likelihood of *ptr being NULL is greater than the likelihood of
*ptr not being NULL then you save running the extra instructions to make
that determination in free(), e.g. pushes, call, return, pops.
The check for rc NULL is necessary, the only optimization is that having
done the check we already know if we need to free(rc), so while we could
leave the second free() outside the branch it is better to leave it
within the "if" .
Pedro.
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