blob: 71c7f1d36072260b4b226aa09f3047be085cc08c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
|
From fbeaf6c71be2273fde980395974e70eb8e1f4a80 Mon Sep 17 00:00:00 2001
From: Jerry James <loganjerry@gmail.com>
Date: Sat, 23 Jun 2018 22:49:04 +0200
Subject: [PATCH] kconfig: loop boundary condition fix
If buf[-1] just happens to hold the byte 0x0A, then nread can wrap around
to (size_t)-1, leading to invalid memory accesses.
This has caused segmentation faults when trying to build the latest
kernel snapshots for i686 in Fedora:
https://bugzilla.redhat.com/show_bug.cgi?id=1592374
Signed-off-by: Jerry James <loganjerry@gmail.com>
[alexpl@fedoraproject.org: reformatted patch for submission]
Signed-off-by: Alexander Ploumistos <alexpl@fedoraproject.org>
---
scripts/kconfig/preprocess.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/scripts/kconfig/preprocess.c b/scripts/kconfig/preprocess.c
index 65da87fce907..5ca2df790d3c 100644
--- a/scripts/kconfig/preprocess.c
+++ b/scripts/kconfig/preprocess.c
@@ -156,7 +156,7 @@ static char *do_shell(int argc, char *argv[])
nread--;
/* remove trailing new lines */
- while (buf[nread - 1] == '\n')
+ while (nread > 0 && buf[nread - 1] == '\n')
nread--;
buf[nread] = 0;
--
2.17.1
|
