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
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
From b136fa14d26d1833ffcb852f86e65da5960cfb99 Mon Sep 17 00:00:00 2001
From: Chris Coulson <chris.coulson@canonical.com>
Date: Tue, 1 Dec 2020 23:41:24 +0000
Subject: [PATCH] commands/hashsum: Fix a memory leak
check_list() uses grub_file_getline(), which allocates a buffer.
If the hash list file contains invalid lines, the function leaks
this buffer when it returns an error.
Fixes: CID 176635
Signed-off-by: Chris Coulson <chris.coulson@canonical.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Upstream-Status: Backport [https://git.savannah.gnu.org/cgit/grub.git/commit/?id=8b6f528e52e18b7a69f90b8dc3671d7b1147d9f3]
Signed-off-by: Marta Rybczynska <marta.rybczynska@huawei.com>
---
grub-core/commands/hashsum.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
diff --git a/grub-core/commands/hashsum.c b/grub-core/commands/hashsum.c
index 456ba90..b8a22b0 100644
--- a/grub-core/commands/hashsum.c
+++ b/grub-core/commands/hashsum.c
@@ -128,11 +128,17 @@ check_list (const gcry_md_spec_t *hash, const char *hashfilename,
high = hextoval (*p++);
low = hextoval (*p++);
if (high < 0 || low < 0)
- return grub_error (GRUB_ERR_BAD_FILE_TYPE, "invalid hash list");
+ {
+ grub_free (buf);
+ return grub_error (GRUB_ERR_BAD_FILE_TYPE, "invalid hash list");
+ }
expected[i] = (high << 4) | low;
}
if ((p[0] != ' ' && p[0] != '\t') || (p[1] != ' ' && p[1] != '\t'))
- return grub_error (GRUB_ERR_BAD_FILE_TYPE, "invalid hash list");
+ {
+ grub_free (buf);
+ return grub_error (GRUB_ERR_BAD_FILE_TYPE, "invalid hash list");
+ }
p += 2;
if (prefix)
{
@@ -140,7 +146,10 @@ check_list (const gcry_md_spec_t *hash, const char *hashfilename,
filename = grub_xasprintf ("%s/%s", prefix, p);
if (!filename)
- return grub_errno;
+ {
+ grub_free (buf);
+ return grub_errno;
+ }
file = grub_file_open (filename, GRUB_FILE_TYPE_TO_HASH
| (!uncompress ? GRUB_FILE_TYPE_NO_DECOMPRESS
: GRUB_FILE_TYPE_NONE));
|
