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patch 8.2.1521: reading past end of buffer when reading spellfile

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Problem:    Reading past end of buffer when reading spellfile. (Yegappan
            Lakshmanan)
Solution:   Store the byte length and check for it.
This commit is contained in:
Bram Moolenaar 2020-08-24 20:05:50 +02:00
parent b3ea36c5bc
commit 07399e7f07
3 changed files with 14 additions and 7 deletions
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1
src/spell.h
View File

@ -66,6 +66,7 @@ struct slang_S
int sl_add; // TRUE if it's a .add file.
char_u *sl_fbyts; // case-folded word bytes
long sl_fbyts_len; // length of sl_fbyts
idx_T *sl_fidxs; // case-folded word indexes
char_u *sl_kbyts; // keep-case word bytes
idx_T *sl_kidxs; // keep-case word indexes

18
src/spellfile.c
View File

@ -315,7 +315,7 @@ static int read_compound(FILE *fd, slang_T *slang, int len);
static int set_sofo(slang_T *lp, char_u *from, char_u *to);
static void set_sal_first(slang_T *lp);
static int *mb_str2wide(char_u *s);
static int spell_read_tree(FILE *fd, char_u **bytsp, idx_T **idxsp, int prefixtree, int prefixcnt);
static int spell_read_tree(FILE *fd, char_u **bytsp, long *bytsp_len, idx_T **idxsp, int prefixtree, int prefixcnt);
static idx_T read_tree_node(FILE *fd, char_u *byts, idx_T *idxs, int maxidx, idx_T startidx, int prefixtree, int maxprefcondnr);
static void set_spell_charflags(char_u *flags, int cnt, char_u *upp);
static int set_spell_chartab(char_u *fol, char_u *low, char_u *upp);
@ -553,17 +553,18 @@ truncerr:
}
// <LWORDTREE>
res = spell_read_tree(fd, &lp->sl_fbyts, &lp->sl_fidxs, FALSE, 0);
res = spell_read_tree(fd, &lp->sl_fbyts, &lp->sl_fbyts_len,
&lp->sl_fidxs, FALSE, 0);
if (res != 0)
goto someerror;
// <KWORDTREE>
res = spell_read_tree(fd, &lp->sl_kbyts, &lp->sl_kidxs, FALSE, 0);
res = spell_read_tree(fd, &lp->sl_kbyts, NULL, &lp->sl_kidxs, FALSE, 0);
if (res != 0)
goto someerror;
// <PREFIXTREE>
res = spell_read_tree(fd, &lp->sl_pbyts, &lp->sl_pidxs, TRUE,
res = spell_read_tree(fd, &lp->sl_pbyts, NULL, &lp->sl_pidxs, TRUE,
lp->sl_prefixcnt);
if (res != 0)
goto someerror;
@ -737,7 +738,7 @@ suggest_load_files(void)
* <SUGWORDTREE>: <wordtree>
* Read the trie with the soundfolded words.
*/
if (spell_read_tree(fd, &slang->sl_sbyts, &slang->sl_sidxs,
if (spell_read_tree(fd, &slang->sl_sbyts, NULL, &slang->sl_sidxs,
FALSE, 0) != 0)
{
someerror:
@ -1572,6 +1573,7 @@ mb_str2wide(char_u *s)
spell_read_tree(
FILE *fd,
char_u **bytsp,
long *bytsp_len,
idx_T **idxsp,
int prefixtree, // TRUE for the prefix tree
int prefixcnt) // when "prefixtree" is TRUE: prefix count
@ -1596,6 +1598,8 @@ spell_read_tree(
if (bp == NULL)
return SP_OTHERERROR;
*bytsp = bp;
if (bytsp_len != NULL)
*bytsp_len = len;
// Allocate the index array.
ip = lalloc_clear(len * sizeof(int), TRUE);
@ -5609,8 +5613,8 @@ sug_filltree(spellinfo_T *spin, slang_T *slang)
spin->si_blocks_cnt = 0;
// Skip over any other NUL bytes (same word with different
// flags).
while (byts[n + 1] == 0)
// flags). But don't go over the end.
while (n + 1 < slang->sl_fbyts_len && byts[n + 1] == 0)
{
++n;
++curi[depth];

2
src/version.c
View File

@ -754,6 +754,8 @@ static char *(features[]) =
static int included_patches[] =
{ /* Add new patch number below this line */
/**/
1521,
/**/
1520,
/**/