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patch 8.2.3063: crash when switching 'cryptmethod' to xchaha20 with undo file

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Problem:    Crash when switching 'cryptmethod' to xchaha20 with an existing
            undo file. (Martin Tournoij)
Solution:   Disable reading undo file when decoding can't be done inplace.
            (issue #8467)
This commit is contained in:
Bram Moolenaar
2021-06-27 14:08:24 +02:00
parent 4cd5c52d64
commit 65aee0b714
3 changed files with 22 additions and 2 deletions
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14
src/bufwrite.c
View File

@@ -494,14 +494,16 @@ buf_write_bytes(struct bw_info *ip)
if (crypt_works_inplace(ip->bw_buffer->b_cryptstate))
{
# endif
crypt_encode_inplace(ip->bw_buffer->b_cryptstate, buf, len, ip->bw_finish);
crypt_encode_inplace(ip->bw_buffer->b_cryptstate, buf, len,
ip->bw_finish);
# ifdef CRYPT_NOT_INPLACE
}
else
{
char_u *outbuf;
len = crypt_encode_alloc(curbuf->b_cryptstate, buf, len, &outbuf, ip->bw_finish);
len = crypt_encode_alloc(curbuf->b_cryptstate, buf, len, &outbuf,
ip->bw_finish);
if (len == 0)
return OK; // Crypt layer is buffering, will flush later.
wlen = write_eintr(ip->bw_fd, outbuf, len);
@@ -1980,10 +1982,18 @@ restore_backup:
write_info.bw_start_lnum = start;
#ifdef FEAT_PERSISTENT_UNDO
// TODO: if the selected crypt method prevents the undo file from being
// written, and existing undo file should be deleted.
write_undo_file = (buf->b_p_udf
&& overwriting
&& !append
&& !filtering
# ifdef CRYPT_NOT_INPLACE
// writing undo file requires
// crypt_encode_inplace()
&& (curbuf->b_cryptstate == NULL
|| crypt_works_inplace(curbuf->b_cryptstate))
# endif
&& reset_changed
&& !checking_conversion);
if (write_undo_file)