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AddressSanitizer: heap-buffer-overflow on address 0x6020000003af ...
#0 0x7f9a83cbb402 in tchandle_type_parse src/meta.c:89
#1 0x7f9a83c6753f in symbol_parse src/datatype.c:138
strlen() - 1 can underflow if length was 0.
Simplify the function, there is no need to duplicate the string
while scanning it.
Expect the first strtol to stop at ':', scan for the minor number next.
The second scan is required to stop at '\0'.
Fixes: 6f2eb8548e0d ("src: meta priority support using tc classid")
Signed-off-by: Florian Westphal <fw@strlen.de>
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