5430c095af
This patch fixes corner case in open_memstrem, when stream is created, but nothing is written. This case is present in tgtadm, tgtd management tool. Signed-off-by: Maxim Storchak <m.storchak@gmail.com> SVN-Revision: 47339
80 lines
2.2 KiB
Diff
80 lines
2.2 KiB
Diff
From 7b9f57f207b51132f188f750161953b7baf32154 Mon Sep 17 00:00:00 2001
|
|
From: Rich Felker <dalias@aerifal.cx>
|
|
Date: Thu, 8 Oct 2015 22:03:53 +0000
|
|
Subject: fix open_[w]memstream behavior when no writes take place
|
|
|
|
the specification for these functions requires that the buffer/size
|
|
exposed to the caller be valid after any successful call to fflush or
|
|
fclose on the stream. the implementation's approach is to update them
|
|
only at flush time, but that misses the case where fflush or fclose is
|
|
called without any writes having taken place, in which case the write
|
|
flushing callback will not be called.
|
|
|
|
to fix both the observable bug and the desired invariant, setup empty
|
|
buffers at open time and fail the open operation if no memory is
|
|
available.
|
|
---
|
|
src/stdio/open_memstream.c | 11 +++++++++--
|
|
src/stdio/open_wmemstream.c | 11 +++++++++--
|
|
2 files changed, 18 insertions(+), 4 deletions(-)
|
|
|
|
diff --git a/src/stdio/open_memstream.c b/src/stdio/open_memstream.c
|
|
index 58504c9..eab024d 100644
|
|
--- a/src/stdio/open_memstream.c
|
|
+++ b/src/stdio/open_memstream.c
|
|
@@ -59,14 +59,21 @@ FILE *open_memstream(char **bufp, size_t *sizep)
|
|
{
|
|
FILE *f;
|
|
struct cookie *c;
|
|
+ char *buf;
|
|
+
|
|
if (!(f=malloc(sizeof *f + sizeof *c + BUFSIZ))) return 0;
|
|
+ if (!(buf=malloc(sizeof *buf))) {
|
|
+ free(f);
|
|
+ return 0;
|
|
+ }
|
|
memset(f, 0, sizeof *f + sizeof *c);
|
|
f->cookie = c = (void *)(f+1);
|
|
|
|
c->bufp = bufp;
|
|
c->sizep = sizep;
|
|
- c->pos = c->len = c->space = 0;
|
|
- c->buf = 0;
|
|
+ c->pos = c->len = c->space = *sizep = 0;
|
|
+ c->buf = *bufp = buf;
|
|
+ *buf = 0;
|
|
|
|
f->flags = F_NORD;
|
|
f->fd = -1;
|
|
diff --git a/src/stdio/open_wmemstream.c b/src/stdio/open_wmemstream.c
|
|
index 7ab2c64..4d90cd9 100644
|
|
--- a/src/stdio/open_wmemstream.c
|
|
+++ b/src/stdio/open_wmemstream.c
|
|
@@ -61,14 +61,21 @@ FILE *open_wmemstream(wchar_t **bufp, size_t *sizep)
|
|
{
|
|
FILE *f;
|
|
struct cookie *c;
|
|
+ wchar_t *buf;
|
|
+
|
|
if (!(f=malloc(sizeof *f + sizeof *c))) return 0;
|
|
+ if (!(buf=malloc(sizeof *buf))) {
|
|
+ free(f);
|
|
+ return 0;
|
|
+ }
|
|
memset(f, 0, sizeof *f + sizeof *c);
|
|
f->cookie = c = (void *)(f+1);
|
|
|
|
c->bufp = bufp;
|
|
c->sizep = sizep;
|
|
- c->pos = c->len = c->space = 0;
|
|
- c->buf = 0;
|
|
+ c->pos = c->len = c->space = *sizep = 0;
|
|
+ c->buf = *bufp = buf;
|
|
+ *buf = 0;
|
|
|
|
f->flags = F_NORD;
|
|
f->fd = -1;
|
|
--
|
|
cgit v0.11.2
|
|
|