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patch 9.1.1818: possible crash when calculating topline in diff.c

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Problem:  possible crash when calculating topline in diff.c
          (youngmith)
Solution: Check for pointer being Null before accessing it

fixes: #18437

Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
Christian Brabandt
2025-10-01 21:25:40 +00:00
parent 34959362b6
commit d32b3bb7eb
3 changed files with 28 additions and 1 deletions
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4
src/diff.c
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@ -2226,6 +2226,7 @@ calculate_topfill_and_topline(
diff_T *thistopdiff = NULL;
diff_T *next_adjacent_blocks = NULL;
int virtual_lines_passed = 0;
int curlinenum_to = 1;
find_top_diff_block(&thistopdiff, &next_adjacent_blocks, fromidx, from_topline);
@ -2253,7 +2254,8 @@ calculate_topfill_and_topline(
// move the same amount of virtual lines in the target buffer to find the
// cursor's line number
int curlinenum_to = thistopdiff->df_lnum[toidx];
if (thistopdiff != NULL)
curlinenum_to = thistopdiff->df_lnum[toidx];
int virt_lines_left = virtual_lines_passed;
curdif = thistopdiff;