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From fa2acae4f13209aaefa5a38d046aca3da545fe63 Mon Sep 17 00:00:00 2001
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From: Benjamin Tissoires <benjamin.tissoires@gmail.com>
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Date: Thu, 11 Apr 2019 17:21:17 +0200
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Subject: [PATCH 9/9] Fix covscan complain
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covscan gets confused by the test before the XtFree.
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Error: RESOURCE_LEAK (CWE-772):
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libXt-20190411/src/Event.c:743: alloc_fn: Storage is returned from allocation function "__XtMalloc".
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libXt-20190411/src/Event.c:743: var_assign: Assigning: "proc" = storage returned from "__XtMalloc((Cardinal)((size_t)numprocs * 16UL))".
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libXt-20190411/src/Event.c:745: var_assign: Assigning: "closure" = "proc".
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libXt-20190411/src/Event.c:776: leaked_storage: Variable "closure" going out of scope leaks the storage it points to.
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libXt-20190411/src/Event.c:776: leaked_storage: Variable "proc" going out of scope leaks the storage it points to.
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Mixing static arrays and dynamic ones was a good idea
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in the 90s when malloc was expensive, but now, we should
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probably make the code clearer by just allocating the
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memory when needed.
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Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
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---
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src/Event.c | 17 +++++------------
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1 file changed, 5 insertions(+), 12 deletions(-)
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diff --git a/src/Event.c b/src/Event.c
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index 11823d6..c01b65d 100644
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--- a/src/Event.c
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+++ b/src/Event.c
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@@ -725,8 +725,6 @@ static Boolean CallEventHandlers(
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register XtEventRec *p;
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XtEventHandler *proc;
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XtPointer *closure;
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- XtEventHandler procs[EHMAXSIZE];
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- XtPointer closures[EHMAXSIZE];
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Boolean cont_to_disp = True;
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int i, numprocs;
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@@ -739,14 +737,10 @@ static Boolean CallEventHandlers(
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(p->has_type_specifier && event->type == EXT_TYPE(p)))
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numprocs++;
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}
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- if (numprocs > EHMAXSIZE) {
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- proc = (XtEventHandler *)__XtMalloc(numprocs * (sizeof(XtEventHandler) +
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- sizeof(XtPointer)));
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- closure = (XtPointer *)(proc + numprocs);
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- } else {
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- proc = procs;
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- closure = closures;
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- }
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+ proc = (XtEventHandler *)__XtMalloc(numprocs * (sizeof(XtEventHandler) +
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+ sizeof(XtPointer)));
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+ closure = (XtPointer *)(proc + numprocs);
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+
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numprocs = 0;
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for (p=widget->core.event_table; p; p = p->next) {
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if ((!p->has_type_specifier && (mask & p->mask)) ||
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@@ -771,8 +765,7 @@ static Boolean CallEventHandlers(
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*/
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for (i = 0; i < numprocs && cont_to_disp; i++)
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(*(proc[i]))(widget, closure[i], event, &cont_to_disp);
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- if (numprocs > EHMAXSIZE)
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- XtFree((char *)proc);
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+ XtFree((char *)proc);
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return cont_to_disp;
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}
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--
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2.19.2
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