netdev - [PATCH v2] tools/bpftool: silence a static checker warning

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Message-ID: <20180118093521.GA19707@mwanda>
Date:   Thu, 18 Jan 2018 12:35:21 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Alexei Starovoitov <ast@...nel.org>
Cc:     Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH v2] tools/bpftool: silence a static checker warning

There is a static checker warning that "proglen" has an upper bound but
no lower bound.  The allocation will just fail harmlessly so it's not a
big deal.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
v2: change the type to unsigned instead of checking for negatives

diff --git a/tools/bpf/bpf_jit_disasm.c b/tools/bpf/bpf_jit_disasm.c
index 30044bc4f389..58c2bab4ef6e 100644
--- a/tools/bpf/bpf_jit_disasm.c
+++ b/tools/bpf/bpf_jit_disasm.c
@@ -172,7 +172,8 @@ static uint8_t *get_last_jit_image(char *haystack, size_t hlen,
 {
 	char *ptr, *pptr, *tmp;
 	off_t off = 0;
-	int ret, flen, proglen, pass, ulen = 0;
+	unsigned int proglen;
+	int ret, flen, pass, ulen = 0;
 	regmatch_t pmatch[1];
 	unsigned long base;
 	regex_t regex;
@@ -199,7 +200,7 @@ static uint8_t *get_last_jit_image(char *haystack, size_t hlen,
 	}
 
 	ptr = haystack + off - (pmatch[0].rm_eo - pmatch[0].rm_so);
-	ret = sscanf(ptr, "flen=%d proglen=%d pass=%d image=%lx",
+	ret = sscanf(ptr, "flen=%d proglen=%u pass=%d image=%lx",
 		     &flen, &proglen, &pass, &base);
 	if (ret != 4) {
 		regfree(&regex);
@@ -239,7 +240,7 @@ static uint8_t *get_last_jit_image(char *haystack, size_t hlen,
 	}
 
 	assert(ulen == proglen);
-	printf("%d bytes emitted from JIT compiler (pass:%d, flen:%d)\n",
+	printf("%u bytes emitted from JIT compiler (pass:%d, flen:%d)\n",
 	       proglen, pass, flen);
 	printf("%lx + <x>:\n", base);