mirrors/postgres
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Avoid possibly accessing off the end of memory in SJIS2004 conversion.

Browse Source 
The code in shift_jis_20042euc_jis_2004() would fetch two bytes even when
only one remained in the string.  Since conversion functions aren't
supposed to assume null-terminated input, this poses a small risk of
fetching past the end of memory and incurring SIGSEGV.  No such crash has
been identified in the field, but we've certainly seen the equivalent
happen in other code paths, so patch this one all the way back.

Report and patch by Noah Misch.
This commit is contained in:
Tom Lane 2011-09-06 14:50:28 -04:00
parent 780a342c90
commit 623f77e9d1
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
src/backend/utils/mb/conversion_procs/euc2004_sjis2004/euc2004_sjis2004.c
View File

@ -218,8 +218,7 @@ get_ten(int b, int *ku)
static void
shift_jis_20042euc_jis_2004(const unsigned char *sjis, unsigned char *p, int len)
{
int c1,
c2;
int c1;
int ku,
ten,
kubun;
@ -229,7 +228,6 @@ shift_jis_20042euc_jis_2004(const unsigned char *sjis, unsigned char *p, int len
while (len > 0)
{
c1 = *sjis;
c2 = sjis[1];
if (!IS_HIGHBIT_SET(c1))
{
@ -245,7 +243,7 @@ shift_jis_20042euc_jis_2004(const unsigned char *sjis, unsigned char *p, int len
l = pg_encoding_verifymb(PG_SHIFT_JIS_2004, (const char *) sjis, len);
if (l < 0)
if (l < 0 || l > len)
report_invalid_encoding(PG_SHIFT_JIS_2004,
(const char *) sjis, len);
@ -257,6 +255,8 @@ shift_jis_20042euc_jis_2004(const unsigned char *sjis, unsigned char *p, int len
}
else if (l == 2)
{
int c2 = sjis[1];
plane = 1;
ku = 1;
ten = 1;