cups: fix CVE-2020-10001

A buffer (read) overflow in the ippReadIO function.

References:
https://nvd.nist.gov/vuln/detail/CVE-2020-10001

Upstream patches:
https://github.com/OpenPrinting/cups/commit/efbea1742bd30f842fbbfb87a473e5c84f4162f9

(From OE-Core rev: 90eba79bf6f623aa3021eafd0141dad1c3059001)

Signed-off-by: Stefan Ghinea <stefan.ghinea@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 75 insertions, 0 deletions

diff --git a/meta/recipes-extended/cups/cups.inc b/meta/recipes-extended/cups/cups.inc
index 4a1177467b..244c87001f 100644
--- a/meta/recipes-extended/cups/cups.inc
+++ b/meta/recipes-extended/cups/cups.inc
@@ -15,6 +15,7 @@ SRC_URI = "https://github.com/apple/cups/releases/download/v${PV}/${BP}-source.t
            file://0004-cups-fix-multilib-install-file-conflicts.patch \
            file://volatiles.99_cups \
            file://cups-volatiles.conf \
+           file://CVE-2020-10001.patch \
            "
 
 UPSTREAM_CHECK_URI = "https://github.com/apple/cups/releases"
diff --git a/meta/recipes-extended/cups/cups/CVE-2020-10001.patch b/meta/recipes-extended/cups/cups/CVE-2020-10001.patch
new file mode 100644
index 0000000000..09a0a5765d
--- /dev/null
+++ b/meta/recipes-extended/cups/cups/CVE-2020-10001.patch
@@ -0,0 +1,74 @@
+From efbea1742bd30f842fbbfb87a473e5c84f4162f9 Mon Sep 17 00:00:00 2001
+From: Michael R Sweet <msweet@msweet.org>
+Date: Mon, 1 Feb 2021 15:02:32 -0500
+Subject: [PATCH] Fix a buffer (read) overflow in ippReadIO (CVE-2020-10001)
+
+Upstream-Status: Backport
+CVE: CVE-2020-10001
+
+Reference to upstream patch:
+[https://github.com/OpenPrinting/cups/commit/efbea1742bd30f842fbbfb87a473e5c84f4162f9]
+
+[SG: Addapted for version 2.3.3]
+Signed-off-by: Stefan Ghinea <stefan.ghinea@windriver.com>
+---
+ CHANGES.md | 2 ++
+ cups/ipp.c | 8 +++++---
+ 2 files changed, 7 insertions(+), 3 deletions(-)
+
+diff --git a/CHANGES.md b/CHANGES.md
+index df72892..5ca12da 100644
+--- a/CHANGES.md
++++ b/CHANGES.md
+@@ -4,6 +4,8 @@ CHANGES - 2.3.3 - 2020-04-24
+ Changes in CUPS v2.3.3
+ ----------------------
+ 
++- Security: Fixed a buffer (read) overflow in the `ippReadIO` function
++  (CVE-2020-10001)
+ - CVE-2020-3898: The `ppdOpen` function did not handle invalid UI
+   constraint.  `ppdcSource::get_resolution` function did not handle
+   invalid resolution strings.
+diff --git a/cups/ipp.c b/cups/ipp.c
+index 3d52934..adbb26f 100644
+--- a/cups/ipp.c
++++ b/cups/ipp.c
+@@ -2866,7 +2866,8 @@ ippReadIO(void       *src,                /* I - Data source */
+   unsigned char                *buffer,        /* Data buffer */
+                        string[IPP_MAX_TEXT],
+                                        /* Small string buffer */
+-                       *bufptr;        /* Pointer into buffer */
++                       *bufptr,        /* Pointer into buffer */
++                       *bufend;        /* End of buffer */
+   ipp_attribute_t      *attr;          /* Current attribute */
+   ipp_tag_t            tag;            /* Current tag */
+   ipp_tag_t            value_tag;      /* Current value tag */
+@@ -3441,6 +3442,7 @@ ippReadIO(void       *src,                /* I - Data source */
+                }
+ 
+                 bufptr = buffer;
++                bufend = buffer + n;
+ 
+               /*
+                * text-with-language and name-with-language are composite
+@@ -3454,7 +3456,7 @@ ippReadIO(void       *src,                /* I - Data source */
+ 
+                n = (bufptr[0] << 8) | bufptr[1];
+ 
+-               if ((bufptr + 2 + n) >= (buffer + IPP_BUF_SIZE) || n >= (int)sizeof(string))
++               if ((bufptr + 2 + n + 2) > bufend || n >= (int)sizeof(string))
+                {
+                  _cupsSetError(IPP_STATUS_ERROR_INTERNAL,
+                                _("IPP language length overflows value."), 1);
+@@ -3481,7 +3483,7 @@ ippReadIO(void       *src,                /* I - Data source */
+                 bufptr += 2 + n;
+                n = (bufptr[0] << 8) | bufptr[1];
+ 
+-               if ((bufptr + 2 + n) >= (buffer + IPP_BUF_SIZE))
++               if ((bufptr + 2 + n) > bufend)
+                {
+                  _cupsSetError(IPP_STATUS_ERROR_INTERNAL,
+                                _("IPP string length overflows value."), 1);
+-- 
+2.17.1
+