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compat/win32: correct for incorrect compiler warning

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The 'win build' job of our CI build is failing with the following error:

compat/win32/syslog.c: In function 'syslog':
compat/win32/syslog.c:53:17: error: pointer 'pos' may be used after \
				    'realloc' [-Werror=use-after-free]
   53 |                 memmove(pos + 2, pos + 1, strlen(pos));
    CC compat/poll/poll.o
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compat/win32/syslog.c:47:23: note: call to 'realloc' here
   47 |                 str = realloc(str, st_add(++str_len, 1));
      |                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

However, between this realloc() and the use we have a line that resets
the value of 'pos'. Thus, this error is incorrect. It is likely due to a
new version of the compiler on the CI machines.

Instead of waiting for a new compiler, create a new variable to avoid
this error.

Signed-off-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee 2022-07-19 18:45:54 +00:00 committed by Junio C Hamano
parent bbea4dcf42
commit b4f52f09ae
1 changed files with 4 additions and 3 deletions
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7
compat/win32/syslog.c
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@ -44,6 +44,7 @@ void syslog(int priority, const char *fmt, ...)
while ((pos = strstr(str, "%1")) != NULL) {
size_t offset = pos - str;
char *new_pos;
char *oldstr = str;
str = realloc(str, st_add(++str_len, 1));
if (!str) {
@ -51,9 +52,9 @@ void syslog(int priority, const char *fmt, ...)
warning_errno("realloc failed");
return;
}
pos = str + offset;
memmove(pos + 2, pos + 1, strlen(pos));
pos[1] = ' ';
new_pos = str + offset;
memmove(new_pos + 2, new_pos + 1, strlen(new_pos));
new_pos[1] = ' ';
}
switch (priority) {