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image: don't free an img object from pb_write_one()

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This is unexpected behaviour.
pb_write_one
  open_image_lazy
    do_open_image
      xfree(img)

255             if (pb_write_one(img, &cpu_info, PB_CPUINFO) < 0) {
>>> >>>     CID 92728:  Memory - illegal accesses  (USE_AFTER_FREE)
>>> >>>     Calling "close_image" dereferences freed pointer "img".
256                     close_image(img);
257                     return -1;
258             }

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Andrey Vagin 2015-05-01 16:03:00 +03:00 • committed by Pavel Emelyanov
parent 281a0f9d20
commit af555618c6
1 changed files with 18 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

31
image.c
View file

@ -212,7 +212,7 @@ struct cr_imgset *cr_glob_imgset_open(int mode)
return cr_imgset_open(-1 /* ignored */, GLOB, mode);
}
static struct cr_img *do_open_image(struct cr_img *img, int dfd, int type, unsigned long flags, char *path);
static int do_open_image(struct cr_img *img, int dfd, int type, unsigned long flags, char *path);
struct cr_img *open_image_at(int dfd, int type, unsigned long flags, ...)
{
@ -243,9 +243,15 @@ struct cr_img *open_image_at(int dfd, int type, unsigned long flags, ...)
img->oflags = oflags;
img->path = xstrdup(path);
return img;
} else
img->fd = EMPTY_IMG_FD;
if (do_open_image(img, dfd, type, oflags, path)) {
close_image(img);
return NULL;
}
return do_open_image(img, dfd, type, oflags, path);
return img;
}
static inline u32 head_magic(int oflags)
@ -291,7 +297,7 @@ static int img_write_magic(struct cr_img *img, int oflags, int type)
return write_img(img, &imgset_template[type].magic);
}
static struct cr_img *do_open_image(struct cr_img *img, int dfd, int type, unsigned long oflags, char *path)
static int do_open_image(struct cr_img *img, int dfd, int type, unsigned long oflags, char *path)
{
int ret, flags;
@ -319,7 +325,7 @@ static struct cr_img *do_open_image(struct cr_img *img, int dfd, int type, unsig
ret = bfdopenw(&img->_x);
if (ret)
goto err_close;
goto err;
}
if (imgset_template[type].magic == RAW_IMAGE_MAGIC)
@ -330,18 +336,13 @@ static struct cr_img *do_open_image(struct cr_img *img, int dfd, int type, unsig
else
ret = img_write_magic(img, oflags, type);
if (ret)
goto err_close;
goto err;
skip_magic:
return img;
return 0;
err:
xfree(img);
return NULL;
err_close:
close_image(img);
return NULL;
return -1;
}
int open_image_lazy(struct cr_img *img)
@ -349,9 +350,13 @@ int open_image_lazy(struct cr_img *img)
int dfd;
char *path = img->path;
img->path = NULL;
dfd = get_service_fd(IMG_FD_OFF);
if (do_open_image(img, dfd, img->type, img->oflags, path) == NULL)
if (do_open_image(img, dfd, img->type, img->oflags, path)) {
xfree(path);
return -1;
}
xfree(path);
return 0;