libmtd_legacy: don't open device in R/W

On legacy kernels with ROM devices, we can get mtdinfo errors like:

libmtd: error!: cannot open "/dev/mtd4"
        error 13 (Permission denied)
mtdinfo: error!: libmtd failed get MTD device 4 information
         error 13 (Permission denied)

We don't need O_RDRW access for informational ioctls(), so make this
O_RDONLY.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

diff --git a/lib/libmtd_legacy.c b/lib/libmtd_legacy.c
index d3f16727aae38210e0f685e7d1504a289a769811..1ae99464505b76502794e7cb988e17ffdac49df1 100644 (file)
--- a/lib/libmtd_legacy.c
+++ b/lib/libmtd_legacy.c
@@ -262,7 +262,7 @@ int legacy_get_dev_info(const char *node, struct mtd_dev_info *mtd)
 
        mtd->mtd_num = mtd->minor / 2;
 
-       fd = open(node, O_RDWR);
+       fd = open(node, O_RDONLY);
        if (fd == -1)
                return sys_errmsg("cannot open \"%s\"", node);