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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Chris Coulson <chris.coulson@canonical.com>
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Date: Tue, 1 Dec 2020 23:41:24 +0000
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Subject: [PATCH] commands/hashsum: Fix a memory leak
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check_list() uses grub_file_getline(), which allocates a buffer.
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If the hash list file contains invalid lines, the function leaks
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this buffer when it returns an error.
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Fixes: CID 176635
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Signed-off-by: Chris Coulson <chris.coulson@canonical.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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grub-core/commands/hashsum.c | 15 ++++++++++++---
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1 file changed, 12 insertions(+), 3 deletions(-)
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diff --git a/grub-core/commands/hashsum.c b/grub-core/commands/hashsum.c
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index 456ba908b..b8a22b0c8 100644
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--- a/grub-core/commands/hashsum.c
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+++ b/grub-core/commands/hashsum.c
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@@ -128,11 +128,17 @@ check_list (const gcry_md_spec_t *hash, const char *hashfilename,
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high = hextoval (*p++);
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low = hextoval (*p++);
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if (high < 0 || low < 0)
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- return grub_error (GRUB_ERR_BAD_FILE_TYPE, "invalid hash list");
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+ {
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+ grub_free (buf);
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+ return grub_error (GRUB_ERR_BAD_FILE_TYPE, "invalid hash list");
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+ }
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expected[i] = (high << 4) | low;
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}
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if ((p[0] != ' ' && p[0] != '\t') || (p[1] != ' ' && p[1] != '\t'))
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- return grub_error (GRUB_ERR_BAD_FILE_TYPE, "invalid hash list");
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+ {
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+ grub_free (buf);
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+ return grub_error (GRUB_ERR_BAD_FILE_TYPE, "invalid hash list");
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+ }
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p += 2;
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if (prefix)
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{
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@@ -140,7 +146,10 @@ check_list (const gcry_md_spec_t *hash, const char *hashfilename,
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filename = grub_xasprintf ("%s/%s", prefix, p);
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if (!filename)
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- return grub_errno;
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+ {
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+ grub_free (buf);
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+ return grub_errno;
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+ }
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file = grub_file_open (filename, GRUB_FILE_TYPE_TO_HASH
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| (!uncompress ? GRUB_FILE_TYPE_NO_DECOMPRESS
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: GRUB_FILE_TYPE_NONE));
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