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patch 9.1.0658: Coverity warns about dereferencing NULL pointer.

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Problem:  Coverity warns about dereferencing NULL pointer.
Solution: Bail out if vim_strrchr() returns NULL.
          (zeertzjq)

________________________________________________________________________________________________________
*** CID 1616019:    (NULL_RETURNS)
/src/help.c: 834 in fix_help_buffer()
828                                  continue;
829                              t2 = gettail(f2);
830                              e2 = vim_strrchr(t2, '.');
831                              if (e1 - f1 != e2 - f2
832                                          || fnamencmp(f1, f2, e1 - f1) != 0)
833                                  continue;
>>>     CID 1616019:    (NULL_RETURNS)
>>>     Dereferencing a pointer that might be "NULL" "(char_u *)e2" when calling "vim_fnamecmp".
834                              if (fnamecmp(e1, ".txt") == 0
835                                             && fnamecmp(e2, fname + 4) == 0)
836                                  // use .abx instead of .txt
837                                  VIM_CLEAR(fnames[i1]);
838                          }
839                      }
/src/help.c: 816 in fix_help_buffer()
810                      // the same directory.
811                      for (i1 = 0; i1 < fcount; ++i1)
812                      {
813                          f1 = fnames[i1];
814                          t1 = gettail(f1);
815                          e1 = vim_strrchr(t1, '.');
>>>     CID 1616019:    (NULL_RETURNS)
>>>     Dereferencing a pointer that might be "NULL" "(char_u *)e1" when calling "vim_fnamecmp".
816                          if (fnamecmp(e1, ".txt") != 0
817                                             && fnamecmp(e1, fname + 4) != 0)
818                          {
819                              // Not .txt and not .abx, remove it.
820                              VIM_CLEAR(fnames[i1]);
821                              continue;

closes: #15420

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
zeertzjq
2024-08-03 14:52:00 +02:00
committed by Christian Brabandt
parent 6228481b8e
commit 62d861741b
2 changed files with 6 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
src/help.c
View File

@ -813,6 +813,8 @@ fix_help_buffer(void)
f1 = fnames[i1];
t1 = gettail(f1);
e1 = vim_strrchr(t1, '.');
if (e1 == NULL)
continue;
if (fnamecmp(e1, ".txt") != 0
&& fnamecmp(e1, fname + 4) != 0)
{
@ -828,6 +830,8 @@ fix_help_buffer(void)
continue;
t2 = gettail(f2);
e2 = vim_strrchr(t2, '.');
if (e2 == NULL)
continue;
if (e1 - f1 != e2 - f2
|| fnamencmp(f1, f2, e1 - f1) != 0)
continue;

2
src/version.c
View File

@ -704,6 +704,8 @@ static char *(features[]) =
static int included_patches[] =
{ /* Add new patch number below this line */
/**/
658,
/**/
657,
/**/