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d="scan'208";a="85360552" From: Andrew Cooper To: Xen-devel CC: =?UTF-8?q?Edwin=20T=C3=B6r=C3=B6k?= , Christian Lindig , David Scott , Rob Hoes Subject: [PATCH 8/8] tools/oxenstored/syslog: Avoid potential NULL dereference Date: Tue, 22 Nov 2022 15:20:43 +0000 Message-ID: <20221122152043.8518-9-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20221122152043.8518-1-andrew.cooper3@citrix.com> References: <20221122152043.8518-1-andrew.cooper3@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1669130492264100003 From: Edwin T=C3=B6r=C3=B6k strdup() may return NULL. Check for this before passing to syslog(). Drop const from c_msg. It is bogus, as demonstrated by the need to cast to void * in order to free the memory. Signed-off-by: Edwin T=C3=B6r=C3=B6k Acked-by: Christian Lindig --- CC: Christian Lindig CC: David Scott CC: Edwin Torok CC: Rob Hoes --- tools/ocaml/xenstored/syslog_stubs.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/tools/ocaml/xenstored/syslog_stubs.c b/tools/ocaml/xenstored/s= yslog_stubs.c index 875d48ad57eb..e16c3a9491d0 100644 --- a/tools/ocaml/xenstored/syslog_stubs.c +++ b/tools/ocaml/xenstored/syslog_stubs.c @@ -14,6 +14,7 @@ =20 #include #include +#include #include #include #include @@ -35,14 +36,16 @@ static int __syslog_facility_table[] =3D { value stub_syslog(value facility, value level, value msg) { CAMLparam3(facility, level, msg); - const char *c_msg =3D strdup(String_val(msg)); + char *c_msg =3D strdup(String_val(msg)); int c_facility =3D __syslog_facility_table[Int_val(facility)] | __syslog_level_table[Int_val(level)]; =20 + if ( !c_msg ) + caml_raise_out_of_memory(); caml_enter_blocking_section(); syslog(c_facility, "%s", c_msg); caml_leave_blocking_section(); =20 - free((void*)c_msg); + free(c_msg); CAMLreturn(Val_unit); } --=20 2.11.0