[PATCH 2/3] mkimage: fit: Unmmap the memory before closing fd in fit_import_data()
Bin Meng
bmeng.cn at gmail.com
Sat Apr 18 10:59:10 CEST 2020
From: Lihua Zhao <lihua.zhao at windriver.com>
Without calling munmap(), the follow-up call to open() the same file
with a flag O_TRUNC seems not to cause any issue on Linux, but it fails
on Windows with error like below:
Can't open kernel_fdt.itb.tmp: Permission denied
Fix this by unmapping the memory before closing fd in fit_import_data().
Signed-off-by: Lihua Zhao <lihua.zhao at windriver.com>
Signed-off-by: Bin Meng <bin.meng at windriver.com>
---
tools/fit_image.c | 24 ++++++++++++++----------
1 file changed, 14 insertions(+), 10 deletions(-)
diff --git a/tools/fit_image.c b/tools/fit_image.c
index dd61a81..05c1f00 100644
--- a/tools/fit_image.c
+++ b/tools/fit_image.c
@@ -556,21 +556,21 @@ static int fit_import_data(struct image_tool_params *params, const char *fname)
fprintf(stderr, "%s: Failed to allocate memory (%d bytes)\n",
__func__, size);
ret = -ENOMEM;
- goto err_has_fd;
+ goto err_munmap;
}
ret = fdt_open_into(old_fdt, fdt, size);
if (ret) {
debug("%s: Failed to expand FIT: %s\n", __func__,
fdt_strerror(errno));
ret = -EINVAL;
- goto err_has_fd;
+ goto err_munmap;
}
images = fdt_path_offset(fdt, FIT_IMAGES_PATH);
if (images < 0) {
debug("%s: Cannot find /images node: %d\n", __func__, images);
ret = -EINVAL;
- goto err_has_fd;
+ goto err_munmap;
}
for (node = fdt_first_subnode(fdt, images);
@@ -591,10 +591,12 @@ static int fit_import_data(struct image_tool_params *params, const char *fname)
debug("%s: Failed to write property: %s\n", __func__,
fdt_strerror(ret));
ret = -EINVAL;
- goto err_has_fd;
+ goto err_munmap;
}
}
+ munmap(old_fdt, sbuf.st_size);
+
/* Close the old fd so we can re-use it. */
close(fd);
@@ -609,22 +611,24 @@ static int fit_import_data(struct image_tool_params *params, const char *fname)
fprintf(stderr, "%s: Can't open %s: %s\n",
params->cmdname, fname, strerror(errno));
ret = -EIO;
- goto err_no_fd;
+ goto err;
}
if (write(fd, fdt, new_size) != new_size) {
debug("%s: Failed to write external data to file %s\n",
__func__, strerror(errno));
ret = -EIO;
- goto err_has_fd;
+ goto err;
}
- ret = 0;
-
-err_has_fd:
+ free(fdt);
close(fd);
-err_no_fd:
+ return 0;
+
+err_munmap:
munmap(old_fdt, sbuf.st_size);
+err:
free(fdt);
+ close(fd);
return ret;
}
--
2.7.4
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