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library: protect against possible 'refcount' underflow

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In each module employing a priming read at 'new' time,
should that read fail, a call to 'unref' will be made.

However, there is a hidden dependency that these calls
must never occur before the context 'refcount' was set
due to the way an 'unref' conditional was constructed.

So this commit just ensures that 'unref' will function
as expected, even if called with a 'refcount' of zero.

Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner
2016-11-22 10:10:10 -05:00
committed by Craig Small
parent b3e8581a30
commit e70531a945
6 changed files with 14 additions and 8 deletions
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3
proc/stat.c
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@ -901,9 +901,10 @@ PROCPS_EXPORT int procps_stat_unref (
{
if (info == NULL || *info == NULL)
return -EINVAL;
(*info)->refcount--;
if ((*info)->refcount == 0) {
if ((*info)->refcount < 1) {
if ((*info)->cpus.anchor)
free((*info)->cpus.anchor);
if ((*info)->cpus.result.stacks)