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login: fix potential null pointer dereference

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Fix CID 1304686: Dereference after null check (FORWARD_NULL)

However, this commit does not fix any bug in logind. It helps to keep
the elect_display_compare() function generic.
This commit is contained in:
Ronny Chevalier 2015-06-12 11:37:11 +02:00
parent eb59b60941
commit b9460fdc8b
1 changed files with 3 additions and 0 deletions
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3
src/login/logind-user.c
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@ -763,6 +763,9 @@ static int elect_display_compare(Session *s1, Session *s2) {
* is preferred. * is preferred.
* *
* s1 or s2 may be NULL. */ * s1 or s2 may be NULL. */
if (!s1 && !s2)
return 0;
if ((s1 == NULL) != (s2 == NULL)) if ((s1 == NULL) != (s2 == NULL))
return (s1 == NULL) - (s2 == NULL); return (s1 == NULL) - (s2 == NULL);