linux-kernel - [PATCH] module: prevent warning when finit

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Date:	Fri, 28 Dec 2012 14:27:17 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Rusty Russell <rusty@...tcorp.com.au>, linux-kernel@...r.kernel.org
Cc:	Sasha Levin <sasha.levin@...cle.com>
Subject: [PATCH] module: prevent warning when finit_module a 0 sized file

If we try to finit_module on a file sized 0 bytes vmalloc will
scream and spit out a warning.

Since modules have to be bigger than 0 bytes anyways we can just
check that beforehand and avoid the warning.

Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
---
 kernel/module.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/module.c b/kernel/module.c
index 250092c..2e1ce2e 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2527,6 +2527,12 @@ static int copy_module_from_fd(int fd, struct load_info *info)
 		err = -EFBIG;
 		goto out;
 	}
+
+	if (stat.size == 0) {
+		err = -EINVAL;
+		goto out;
+	}
+
 	info->hdr = vmalloc(stat.size);
 	if (!info->hdr) {
 		err = -ENOMEM;
-- 
1.8.0.2

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