mirror of
https://git.code.sf.net/p/linux-ima/ima-evm-utils
synced 2025-04-28 06:33:36 +02:00
79ff634f7e
Static analysis reported an "invalid operation involving NULL pointer"
warning. Although the code properly exits the loop without ever
using the variable, test the pointer isn't NULL before incrementing
it.
Fixes: 80d3fda6083f ("ima-evm-utils: Check for tsspcrread in runtime")
Reviewed-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
116 lines
2.1 KiB
C
116 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* utils: set of common functions
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*
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* Copyright (C) 2020 Patrick Uiterwijk <patrick@puiterwijk.org>
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* Copyright (C) 2010 Cyril Hrubis <chrubis@suse.cz>
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "utils.h"
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#ifndef MIN
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# define MIN(a, b) ({ \
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typeof(a) _a = (a); \
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typeof(b) _b = (b); \
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_a < _b ? _a : _b; \
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})
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#endif /* MIN */
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static int file_exist(const char *path)
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{
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struct stat st;
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if (!access(path, R_OK) && !stat(path, &st) && S_ISREG(st.st_mode))
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return 1;
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return 0;
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}
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int get_cmd_path(const char *prog_name, char *buf, size_t buf_len)
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{
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const char *path = (const char *)getenv("PATH");
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const char *start = path;
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const char *end;
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size_t size, ret;
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if (path == NULL)
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return -1;
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do {
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end = strchr(start, ':');
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if (end != NULL)
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snprintf(buf, MIN(buf_len, (size_t) (end - start + 1)),
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"%s", start);
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else
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snprintf(buf, buf_len, "%s", start);
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size = strlen(buf);
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/*
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* "::" inside $PATH, $PATH ending with ':' or $PATH starting
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* with ':' should be expanded into current working directory.
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*/
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if (size == 0) {
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snprintf(buf, buf_len, ".");
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size = strlen(buf);
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}
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/*
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* If there is no '/' ad the end of path from $PATH add it.
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*/
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if (buf[size - 1] != '/')
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ret =
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snprintf(buf + size, buf_len - size, "/%s",
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prog_name);
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else
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ret =
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snprintf(buf + size, buf_len - size, "%s",
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prog_name);
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if (buf_len - size > ret && file_exist(buf))
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return 0;
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if (end != NULL)
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start = end + 1;
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} while (end != NULL);
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return -1;
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}
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int hex_to_bin(char ch)
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{
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if ((ch >= '0') && (ch <= '9'))
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return ch - '0';
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ch = tolower(ch);
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if ((ch >= 'a') && (ch <= 'f'))
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return ch - 'a' + 10;
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return -1;
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}
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int hex2bin(void *dst, const char *src, size_t count)
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{
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int hi, lo;
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while (count--) {
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if (*src == ' ')
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src++;
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hi = hex_to_bin(*src++);
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lo = hex_to_bin(*src++);
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if ((hi < 0) || (lo < 0))
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return -1;
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*(uint8_t *)dst++ = (hi << 4) | lo;
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}
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return 0;
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}
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