dcavalca / rpms / grub2

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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 456ba908b6f..b8a22b0c8bb 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));