| Date | Mon, 17 Sep 2012 01:37:19 +0100 | From | Ben Hutchings <> | Subject | [ 054/135] net/core: Fix potential memory leak in dev_set_alias() |
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3.2-stable review patch. If anyone has any objections, please let me know.
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From: Alexey Khoroshilov <khoroshilov@ispras.ru>
[ Upstream commit 7364e445f62825758fa61195d237a5b8ecdd06ec ]
Do not leak memory by updating pointer with potentially NULL realloc return value.
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- net/core/dev.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/net/core/dev.c b/net/core/dev.c index e6f2635..75da76d 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -1059,6 +1059,8 @@ rollback: */ int dev_set_alias(struct net_device *dev, const char *alias, size_t len) { + char *new_ifalias; + ASSERT_RTNL(); if (len >= IFALIASZ) @@ -1072,9 +1074,10 @@ int dev_set_alias(struct net_device *dev, const char *alias, size_t len) return 0; } - dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL); - if (!dev->ifalias) + new_ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL); + if (!new_ifalias) return -ENOMEM; + dev->ifalias = new_ifalias; strlcpy(dev->ifalias, alias, len+1); return len;
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