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net: fool proof dev_valid_name()

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[ Upstream commit a9d48205d0aedda021fc3728972a9e9934c2b9de ]

We want to use dev_valid_name() to validate tunnel names,
so better use strnlen(name, IFNAMSIZ) than strlen(name) to make
sure to not upset KASAN.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eric Dumazet 2018-04-05 06:39:26 -07:00 committed by Greg Kroah-Hartman
parent 359d6e3578
commit 0d1c057dd6
1 changed files with 1 additions and 1 deletions
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2
net/core/dev.c
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@ -993,7 +993,7 @@ bool dev_valid_name(const char *name)
{
if (*name == '\0')
return false;
if (strlen(name) >= IFNAMSIZ)
if (strnlen(name, IFNAMSIZ) == IFNAMSIZ)
return false;
if (!strcmp(name, ".") || !strcmp(name, ".."))
return false;