Date: Mon, 12 Jan 2026 17:19:44 +0000 From: Dag-Erling=?utf-8?Q? Sm=C3=B8rg?=rav <des@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: d39abff4ce1e - stable/13 - libgeom: Improve type safety of xml2tree code Message-ID: <69652d30.3674f.72188849@gitrepo.freebsd.org>
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The branch stable/13 has been updated by des: URL: https://cgit.FreeBSD.org/src/commit/?id=d39abff4ce1eefdee1a17f3bd47d54c8187f667e commit d39abff4ce1eefdee1a17f3bd47d54c8187f667e Author: Dag-Erling Smørgrav <des@FreeBSD.org> AuthorDate: 2026-01-03 09:10:03 +0000 Commit: Dag-Erling Smørgrav <des@FreeBSD.org> CommitDate: 2026-01-11 02:30:46 +0000 libgeom: Improve type safety of xml2tree code When resolving references, assert that the type of the object we find is what we expect. This will help prevent memory corruption if two objects of different types somehow end up with the same identifier. MFC after: 1 week Reviewed by: imp Differential Revision: https://reviews.freebsd.org/D54454 (cherry picked from commit 4b0d5d1d6a7c9773e38882feb4747a76b37a645c) --- lib/libgeom/geom_xml2tree.c | 54 ++++++++++++++++++++++++++++++++++++--------- 1 file changed, 44 insertions(+), 10 deletions(-) diff --git a/lib/libgeom/geom_xml2tree.c b/lib/libgeom/geom_xml2tree.c index 81f7de1be263..03210947d431 100644 --- a/lib/libgeom/geom_xml2tree.c +++ b/lib/libgeom/geom_xml2tree.c @@ -36,6 +36,7 @@ #include <sys/stat.h> #include <sys/sysctl.h> +#include <assert.h> #include <ctype.h> #include <err.h> #include <errno.h> @@ -358,14 +359,47 @@ geom_lookupid(const struct gmesh *gmp, const void *id) } static void * -geom_lookupidptr(struct gmesh *gmp, const void *id) +geom_lookup_class(const struct gmesh *gmp, const void *id) { struct gident *gip; - gip = geom_lookupid(gmp, id); - if (gip) - return (gip->lg_ptr); - return (NULL); + if ((gip = geom_lookupid(gmp, id)) == NULL) + return (NULL); + assert(gip->lg_what == ISCLASS); + return (gip->lg_ptr); +} + +static void * +geom_lookup_geom(const struct gmesh *gmp, const void *id) +{ + struct gident *gip; + + if ((gip = geom_lookupid(gmp, id)) == NULL) + return (NULL); + assert(gip->lg_what == ISGEOM); + return (gip->lg_ptr); +} + +static void * +geom_lookup_provider(const struct gmesh *gmp, const void *id) +{ + struct gident *gip; + + if ((gip = geom_lookupid(gmp, id)) == NULL) + return (NULL); + assert(gip->lg_what == ISPROVIDER); + return (gip->lg_ptr); +} + +static void * __unused +geom_lookup_consumer(const struct gmesh *gmp, const void *id) +{ + struct gident *gip; + + if ((gip = geom_lookupid(gmp, id)) == NULL) + return (NULL); + assert(gip->lg_what == ISCONSUMER); + return (gip->lg_ptr); } int @@ -441,15 +475,15 @@ geom_xml2tree(struct gmesh *gmp, char *p) /* Substitute all identifiers */ LIST_FOREACH(cl, &gmp->lg_class, lg_class) { LIST_FOREACH(ge, &cl->lg_geom, lg_geom) { - ge->lg_class = geom_lookupidptr(gmp, ge->lg_class); + ge->lg_class = geom_lookup_class(gmp, ge->lg_class); LIST_FOREACH(pr, &ge->lg_provider, lg_provider) { - pr->lg_geom = geom_lookupidptr(gmp, pr->lg_geom); + pr->lg_geom = geom_lookup_geom(gmp, pr->lg_geom); } LIST_FOREACH(co, &ge->lg_consumer, lg_consumer) { - co->lg_geom = geom_lookupidptr(gmp, co->lg_geom); + co->lg_geom = geom_lookup_geom(gmp, co->lg_geom); if (co->lg_provider != NULL) { - co->lg_provider = geom_lookupidptr(gmp, - co->lg_provider); + co->lg_provider = geom_lookup_provider(gmp, + co->lg_provider); if (co->lg_provider != NULL) { LIST_INSERT_HEAD( &co->lg_provider->lg_consumers,home | help
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