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isdn/gigaset: fix zero size border case in debug dump
[ Upstream commit d721a1752ba544df8d7d36959038b26bc92bdf80 ] If subtracting 12 from l leaves zero we'd do a zero size allocation, leading to an oops later when we try to set the NUL terminator. Reported-by: Dan Carpenter <email@example.com> Signed-off-by: Tilman Schmidt <firstname.lastname@example.org> Signed-off-by: David S. Miller <email@example.com> Signed-off-by: Greg Kroah-Hartman <firstname.lastname@example.org>
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