diff mbox series

[PATCHv3,3/5] um: Add checks to mtu parameter parsing

Message ID 20190722073025.20844-3-anton.ivanov@cambridgegreys.com
State Not Applicable
Headers show
Series None | expand

Commit Message

Anton Ivanov July 22, 2019, 7:30 a.m. UTC 
From: Anton Ivanov <anton.ivanov@cambridgegreys.com>

Adds a sanity check to the parsing of mtu command line param

Signed-off-by: Anton Ivanov <anton.ivanov@cambridgegreys.com>
---
 arch/um/drivers/vector_kern.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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Patch

diff --git a/arch/um/drivers/vector_kern.c b/arch/um/drivers/vector_kern.c
index e314a60cdc98..e79cd1dcb018 100644
--- a/arch/um/drivers/vector_kern.c
+++ b/arch/um/drivers/vector_kern.c
@@ -121,7 +121,8 @@  static int get_mtu(struct arglist *def)
 
 	if (mtu != NULL) {
 		if (kstrtoul(mtu, 10, &result) == 0)
-			return result;
+			if ((result < (1 << 16) - 1) && (result >= 576))
+				return result;
 	}
 	return ETH_MAX_PACKET;
 }