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patch 8.0.0377: possible overflow when reading corrupted undo file

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Problem:    Possible overflow when reading corrupted undo file.
Solution:   Check if allocated size is not too big. (King)
This commit is contained in:
Bram Moolenaar
2017-02-26 18:11:36 +01:00
parent 6d3c8586fc
commit 3eb1637b1b
2 changed files with 5 additions and 2 deletions
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5
src/undo.c
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@@ -1787,7 +1787,7 @@ u_read_undo(char_u *name, char_u *hash, char_u *orig_name)
linenr_T line_lnum;
colnr_T line_colnr;
linenr_T line_count;
int num_head = 0;
long num_head = 0;
long old_header_seq, new_header_seq, cur_header_seq;
long seq_last, seq_cur;
long last_save_nr = 0;
@@ -1974,7 +1974,8 @@ u_read_undo(char_u *name, char_u *hash, char_u *orig_name)
* When there are no headers uhp_table is NULL. */
if (num_head > 0)
{
uhp_table = (u_header_T **)U_ALLOC_LINE(
if (num_head < LONG_MAX / (long)sizeof(u_header_T *))
uhp_table = (u_header_T **)U_ALLOC_LINE(
num_head * sizeof(u_header_T *));
if (uhp_table == NULL)
goto error;