From a339d6c464dd9e2c952bbdc5baa450149da9d6a3 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Pali=20Roh=C3=A1r?= Date: Wed, 6 Apr 2022 15:18:59 +0200 Subject: [PATCH] tools: kwboot: Replace fstat()+st_size by lseek()+SEEK_END MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit fstat()'s st_size works only for regular files. lseek() with SEEK_END works also for block or MTD devices. This replacement allows kwboot to load kwbimage from /dev/mtd0 for booting another device over /dev/ttyS0. Signed-off-by: Pali Rohár Reviewed-by: Marek Behún --- tools/kwboot.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) diff --git a/tools/kwboot.c b/tools/kwboot.c index 9f2dd2d..b697d3b 100644 --- a/tools/kwboot.c +++ b/tools/kwboot.c @@ -1591,8 +1591,8 @@ static void * kwboot_read_image(const char *path, size_t *size, size_t reserve) { int rc, fd; - struct stat st; void *img; + off_t len; off_t tot; rc = -1; @@ -1602,31 +1602,34 @@ kwboot_read_image(const char *path, size_t *size, size_t reserve) if (fd < 0) goto out; - rc = fstat(fd, &st); - if (rc) + len = lseek(fd, 0, SEEK_END); + if (len == (off_t)-1) + goto out; + + if (lseek(fd, 0, SEEK_SET) == (off_t)-1) goto out; - img = malloc(st.st_size + reserve); + img = malloc(len + reserve); if (!img) goto out; tot = 0; - while (tot < st.st_size) { - ssize_t rd = read(fd, img + tot, st.st_size - tot); + while (tot < len) { + ssize_t rd = read(fd, img + tot, len - tot); if (rd < 0) goto out; tot += rd; - if (!rd && tot < st.st_size) { + if (!rd && tot < len) { errno = EIO; goto out; } } rc = 0; - *size = st.st_size; + *size = len; out: if (rc && img) { free(img); -- 2.7.4