From 9687fd9101afaa1c4b1de7ffd2f9d7e53f45b29f Mon Sep 17 00:00:00 2001 From: David Engraf Date: Fri, 8 Aug 2014 14:23:16 -0700 Subject: [PATCH] initramfs: add write error checks On a system with low memory extracting the initramfs may fail. If this happens the user gets "Failed to execute /init" instead of an initramfs error. Check return value of sys_write and call error() when the write was incomplete or failed. Signed-off-by: David Engraf Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- init/initramfs.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/init/initramfs.c b/init/initramfs.c index a7566031242e..bece48c3461e 100644 --- a/init/initramfs.c +++ b/init/initramfs.c @@ -369,7 +369,8 @@ static int __init do_name(void) static int __init do_copy(void) { if (count >= body_len) { - xwrite(wfd, victim, body_len); + if (xwrite(wfd, victim, body_len) != body_len) + error("write error"); sys_close(wfd); do_utime(vcollected, mtime); kfree(vcollected); @@ -377,7 +378,8 @@ static int __init do_copy(void) state = SkipIt; return 0; } else { - xwrite(wfd, victim, count); + if (xwrite(wfd, victim, count) != count) + error("write error"); body_len -= count; eat(count); return 1;