[Pixman] [PATCH] pixman-general: Fix stack related pointer arithmetic overflow

[Siarhei Siamashka]

As https://bugs.freedesktop.org/show_bug.cgi?id=92027#c6 explains,
the stack is allocated at the very top of the process address space
in some configurations (32-bit x86 systems with ASLR disabled).
And the careless computations done with the 'dest_buffer' pointer
may overflow, failing the buffer upper limit check.

The problem can be reproduced using the 'stress-test' program,
which segfaults when executed via setarch:

    export CFLAGS="-O2 -m32" && ./autogen.sh
    ./configure --disable-libpng --disable-gtk && make
    setarch i686 -R test/stress-test

This patch introduces the required corrections. The extra check
for negative 'width' may be redundant (the invalid 'width' value
is not supposed to reach here), but it's better to play safe
when dealing with the buffers allocated on stack.

Reported-by: Ludovic Courtès <ludo at gnu.org>
Signed-off-by: Siarhei Siamashka <siarhei.siamashka at gmail.com>
---
 pixman/pixman-general.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/pixman/pixman-general.c b/pixman/pixman-general.c
index 7cdea29..fa88463 100644
--- a/pixman/pixman-general.c
+++ b/pixman/pixman-general.c
@@ -155,23 +155,21 @@ general_composite_rect  (pixman_implementation_t *imp,
 #define ALIGN(addr)							\
     ((uint8_t *)((((uintptr_t)(addr)) + 15) & (~15)))
 
-    src_buffer = ALIGN (scanline_buffer);
-    mask_buffer = ALIGN (src_buffer + width * Bpp);
-    dest_buffer = ALIGN (mask_buffer + width * Bpp);
+    if (width <= 0 || _pixman_multiply_overflows_int (width, Bpp * 3))
+	return;
 
-    if (ALIGN (dest_buffer + width * Bpp) >
-	    scanline_buffer + sizeof (stack_scanline_buffer))
+    if (width * Bpp * 3 > sizeof (stack_scanline_buffer) - 32 * 3)
     {
 	scanline_buffer = pixman_malloc_ab_plus_c (width, Bpp * 3, 32 * 3);
 
 	if (!scanline_buffer)
 	    return;
-
-	src_buffer = ALIGN (scanline_buffer);
-	mask_buffer = ALIGN (src_buffer + width * Bpp);
-	dest_buffer = ALIGN (mask_buffer + width * Bpp);
     }
 
+    src_buffer = ALIGN (scanline_buffer);
+    mask_buffer = ALIGN (src_buffer + width * Bpp);
+    dest_buffer = ALIGN (mask_buffer + width * Bpp);
+
     if (width_flag == ITER_WIDE)
     {
 	/* To make sure there aren't any NANs in the buffers */
-- 
2.4.6