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fsutils/passwd: fix warning: leak of ‘iobuffer’ [CWE-401] [-Wanalyzer-malloc-leak]

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In function ‘passwd_find’:
passwd_find.c:82:14: warning: leak of ‘iobuffer’ [CWE-401] [-Wanalyzer-malloc-leak]
   82 |       return -errcode;
      |              ^~~~~~~~
  ‘passwd_find’: events 1-5
    |
    |   65 |   iobuffer = (FAR char *)malloc(CONFIG_FSUTILS_PASSWD_IOBUFFER_SIZE);
    |      |                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    |      |                          |
    |      |                          (1) allocated here
    |   66 |   if (iobuffer == NULL)
    |      |      ~
    |      |      |
    |      |      (2) assuming ‘iobuffer’ is non-NULL
    |      |      (3) following ‘false’ branch (when ‘iobuffer’ is non-NULL)...
    |......
    |   73 |   stream = fopen(CONFIG_FSUTILS_PASSWD_PATH, "r");
    |      |            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    |      |            |
    |      |            (4) ...to here
    |   74 |   if (stream == NULL)
    |      |      ~
    |      |      |
    |      |      (5) following ‘true’ branch (when ‘stream’ is NULL)...
    |
  ‘passwd_find’: event 6
    |
    |   80 |       int errcode = errno;
    |      |                     ^~~~~
    |      |                     |
    |      |                     (6) ...to here
    |
  ‘passwd_find’: event 7
    |
    |   82 |       return -errcode;
    |      |              ^~~~~~~~
    |      |              |
    |      |              (7) ‘iobuffer’ leaks here; was allocated at (1)
    |

Signed-off-by: Junbo Zheng <zhengjunbo1@xiaomi.com>
This commit is contained in:
Junbo Zheng 2023-02-18 14:41:17 +08:00 • committed by Xiang Xiao
parent 49f88d50b2
commit 78b7318a04
1 changed files with 4 additions and 0 deletions
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4
fsutils/passwd/passwd_find.c
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@ -73,6 +73,10 @@ int passwd_find(FAR const char *username, FAR struct passwd_s *passwd)
stream = fopen(CONFIG_FSUTILS_PASSWD_PATH, "r");
if (stream == NULL)
{
/* Free an I/O buffer for the transfer */
free(iobuffer);
int errcode = errno;
DEBUGASSERT(errcode > 0);
return -errcode;