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patch 8.0.0667: memory access error when command follows :endfunc

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Problem:    Memory access error when command follows :endfunction. (Nikolai
            Pavlov)
Solution:   Make memory handling in :function straightforward. (closes #1793)
This commit is contained in:
Bram Moolenaar
2017-06-24 14:48:11 +02:00
parent 5fe691240b
commit 53564f7c1a
3 changed files with 42 additions and 21 deletions
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51
src/userfunc.c
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@@ -1780,6 +1780,7 @@ theend:
ex_function(exarg_T *eap)
{
char_u *theline;
char_u *line_to_free = NULL;
int j;
int c;
int saved_did_emsg;
@@ -2093,10 +2094,15 @@ ex_function(exarg_T *eap)
line_arg = p + 1;
}
}
else if (eap->getline == NULL)
theline = getcmdline(':', 0L, indent);
else
theline = eap->getline(':', eap->cookie, indent);
{
vim_free(line_to_free);
if (eap->getline == NULL)
theline = getcmdline(':', 0L, indent);
else
theline = eap->getline(':', eap->cookie, indent);
line_to_free = theline;
}
if (KeyTyped)
lines_left = Rows - 1;
if (theline == NULL)
@@ -2130,18 +2136,29 @@ ex_function(exarg_T *eap)
/* Check for "endfunction". */
if (checkforcmd(&p, "endfunction", 4) && nesting-- == 0)
{
char_u *nextcmd = NULL;
if (*p == '|')
/* Another command follows. */
eap->nextcmd = vim_strsave(p + 1);
nextcmd = p + 1;
else if (line_arg != NULL && *skipwhite(line_arg) != NUL)
/* Another command follows. */
eap->nextcmd = line_arg;
nextcmd = line_arg;
else if (*p != NUL && *p != '"' && p_verbose > 0)
give_warning2(
(char_u *)_("W22: Text found after :endfunction: %s"),
p, TRUE);
if (line_arg == NULL)
vim_free(theline);
if (nextcmd != NULL)
{
/* Another command follows. If the line came from "eap" we
* can simply point into it, otherwise we need to change
* "eap->cmdlinep". */
eap->nextcmd = nextcmd;
if (line_to_free != NULL)
{
vim_free(*eap->cmdlinep);
*eap->cmdlinep = line_to_free;
line_to_free = NULL;
}
}
break;
}
@@ -2212,24 +2229,15 @@ ex_function(exarg_T *eap)
/* Add the line to the function. */
if (ga_grow(&newlines, 1 + sourcing_lnum_off) == FAIL)
{
if (line_arg == NULL)
vim_free(theline);
goto erret;
}
/* Copy the line to newly allocated memory. get_one_sourceline()
* allocates 250 bytes per line, this saves 80% on average. The cost
* is an extra alloc/free. */
p = vim_strsave(theline);
if (p != NULL)
{
if (line_arg == NULL)
vim_free(theline);
theline = p;
}
((char_u **)(newlines.ga_data))[newlines.ga_len++] = theline;
if (p == NULL)
goto erret;
((char_u **)(newlines.ga_data))[newlines.ga_len++] = p;
/* Add NULL lines for continuation lines, so that the line count is
* equal to the index in the growarray. */
@@ -2428,6 +2436,7 @@ errret_2:
ga_clear_strings(&newlines);
ret_free:
vim_free(skip_until);
vim_free(line_to_free);
vim_free(fudi.fd_newkey);
vim_free(name);
did_emsg |= saved_did_emsg;