gimp/gimp-2.8.22-CVE-2017-17785.patch

131 lines
3.7 KiB
Diff

diff -urNp old/plug-ins/file-fli/fli.c new/plug-ins/file-fli/fli.c
--- old/plug-ins/file-fli/fli.c 2018-01-04 12:19:54.714139464 +0100
+++ new/plug-ins/file-fli/fli.c 2018-01-04 12:34:18.568323629 +0100
@@ -25,6 +25,8 @@
#include "config.h"
+#include <glib/gstdio.h>
+
#include <string.h>
#include <stdio.h>
@@ -461,23 +463,27 @@ void fli_read_brun(FILE *f, s_fli_header
unsigned short yc;
unsigned char *pos;
for (yc=0; yc < fli_header->height; yc++) {
- unsigned short xc, pc, pcnt;
+ unsigned short pc, pcnt;
+ size_t n, xc;
pc=fli_read_char(f);
xc=0;
pos=framebuf+(fli_header->width * yc);
+ n=(size_t)fli_header->width * (fli_header->height-yc);
for (pcnt=pc; pcnt>0; pcnt--) {
unsigned short ps;
ps=fli_read_char(f);
if (ps & 0x80) {
unsigned short len;
- for (len=-(signed char)ps; len>0; len--) {
+ for (len=-(signed char)ps; len>0 && xc<n; len--) {
pos[xc++]=fli_read_char(f);
}
} else {
unsigned char val;
+ size_t len;
+ len=MIN(n-xc,ps);
val=fli_read_char(f);
- memset(&(pos[xc]), val, ps);
- xc+=ps;
+ memset(&(pos[xc]), val, len);
+ xc+=len;
}
}
}
@@ -564,25 +570,34 @@ void fli_read_lc(FILE *f, s_fli_header *
memcpy(framebuf, old_framebuf, fli_header->width * fli_header->height);
firstline = fli_read_short(f);
numline = fli_read_short(f);
+ if (numline > fli_header->height || fli_header->height-numline < firstline)
+ return;
+
for (yc=0; yc < numline; yc++) {
- unsigned short xc, pc, pcnt;
+ unsigned short pc, pcnt;
+ size_t n, xc;
pc=fli_read_char(f);
xc=0;
pos=framebuf+(fli_header->width * (firstline+yc));
+ n=(size_t)fli_header->width * (fli_header->height-firstline-yc);
for (pcnt=pc; pcnt>0; pcnt--) {
unsigned short ps,skip;
skip=fli_read_char(f);
ps=fli_read_char(f);
- xc+=skip;
+ xc+=MIN(n-xc,skip);
if (ps & 0x80) {
unsigned char val;
+ size_t len;
ps=-(signed char)ps;
val=fli_read_char(f);
- memset(&(pos[xc]), val, ps);
- xc+=ps;
+ len=MIN(n-xc,ps);
+ memset(&(pos[xc]), val, len);
+ xc+=len;
} else {
- fread(&(pos[xc]), ps, 1, f);
- xc+=ps;
+ size_t len;
+ len=MIN(n-xc,ps);
+ fread(&(pos[xc]), len, 1, f);
+ xc+=len;
}
}
}
@@ -689,7 +704,8 @@ void fli_read_lc_2(FILE *f, s_fli_header
yc=0;
numline = fli_read_short(f);
for (lc=0; lc < numline; lc++) {
- unsigned short xc, pc, pcnt, lpf, lpn;
+ unsigned short pc, pcnt, lpf, lpn;
+ size_t n, xc;
pc=fli_read_short(f);
lpf=0; lpn=0;
while (pc & 0x8000) {
@@ -700,26 +716,30 @@ void fli_read_lc_2(FILE *f, s_fli_header
}
pc=fli_read_short(f);
}
+ yc=MIN(yc, fli_header->height);
xc=0;
pos=framebuf+(fli_header->width * yc);
+ n=(size_t)fli_header->width * (fli_header->height-yc);
for (pcnt=pc; pcnt>0; pcnt--) {
unsigned short ps,skip;
skip=fli_read_char(f);
ps=fli_read_char(f);
- xc+=skip;
+ xc+=MIN(n-xc,skip);
if (ps & 0x80) {
unsigned char v1,v2;
ps=-(signed char)ps;
v1=fli_read_char(f);
v2=fli_read_char(f);
- while (ps>0) {
+ while (ps>0 && xc+1<n) {
pos[xc++]=v1;
pos[xc++]=v2;
ps--;
}
} else {
- fread(&(pos[xc]), ps, 2, f);
- xc+=ps << 1;
+ size_t len;
+ len=MIN((n-xc)/2,ps);
+ fread(&(pos[xc]), len, 2, f);
+ xc+=len << 1;
}
}
if (lpf) pos[xc]=lpn;