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Fix possible buffer overrun in hba.c.

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Coverty reports a possible buffer overrun in the code that populates the
pg_hba_file_rules view.  It may not be a live bug due to restrictions
on options that can be used together, but let's increase MAX_HBA_OPTIONS
and correct a nearby misleading comment.

Back-patch to 10 where this code arrived.

Reported-by: Julian Hsiao
Discussion: https://postgr.es/m/CADnGQpzbkWdKS2YHNifwAvX5VEsJ5gW49U4o-7UL5pzyTv4vTg%40mail.gmail.com
This commit is contained in:
Thomas Munro 2018-11-13 16:27:08 +13:00
parent 15b9d47c8e
commit 726ca18f94
1 changed files with 6 additions and 3 deletions
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9
src/backend/libpq/hba.c
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@ -2218,10 +2218,12 @@ load_hba(void)
/* /*
* This macro specifies the maximum number of authentication options * This macro specifies the maximum number of authentication options
* that are possible with any given authentication method that is supported. * that are possible with any given authentication method that is supported.
* Currently LDAP supports 10, so the macro value is well above the most any * Currently LDAP supports 11, and there are 3 that are not dependent on
* method needs. * the auth method here. It may not actually be possible to set all of them
* at the same time, but we'll set the macro value high enough to be
* conservative and avoid warnings from static analysis tools.
*/ */
#define MAX_HBA_OPTIONS 12 #define MAX_HBA_OPTIONS 14
/* /*
* Create a text array listing the options specified in the HBA line. * Create a text array listing the options specified in the HBA line.
@ -2327,6 +2329,7 @@ gethba_options(HbaLine *hba)
CStringGetTextDatum(psprintf("radiusports=%s", hba->radiusports_s)); CStringGetTextDatum(psprintf("radiusports=%s", hba->radiusports_s));
} }
/* If you add more options, consider increasing MAX_HBA_OPTIONS. */
Assert(noptions <= MAX_HBA_OPTIONS); Assert(noptions <= MAX_HBA_OPTIONS);
if (noptions > 0) if (noptions > 0)