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net: tcp: Fix possible buffer underflow

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Fix possible underflow in tcp flags parse.

Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
This commit is contained in:
Flavio Ceolin 2022-05-19 04:07:38 -07:00 • committed by Carles Cufí
commit ac2e13b9a1
1 changed files with 3 additions and 1 deletions
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4
subsys/net/ip/tcp.c
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@ -238,7 +238,9 @@ static const char *tcp_flags(uint8_t flags)
len += snprintk(buf + len, BUF_SIZE - len, "URG,");
}
buf[len - 1] = '\0'; /* delete the last comma */
if (len > 0) {
buf[len - 1] = '\0'; /* delete the last comma */
}
}
#undef BUF_SIZE
return buf;