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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: Wed, 18 Nov 2020 00:59:24 +0000
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Subject: [PATCH] kern/parser: Fix a memory leak
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The getline() function supplied to grub_parser_split_cmdline() returns
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a newly allocated buffer and can be called multiple times, but the
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returned buffer is never freed.
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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/kern/parser.c | 20 ++++++++++++++++----
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1 file changed, 16 insertions(+), 4 deletions(-)
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diff --git a/grub-core/kern/parser.c b/grub-core/kern/parser.c
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index d1cf061ad68..39e4df65b86 100644
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--- a/grub-core/kern/parser.c
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+++ b/grub-core/kern/parser.c
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@@ -140,6 +140,7 @@ grub_parser_split_cmdline (const char *cmdline,
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char buffer[1024];
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char *bp = buffer;
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char *rd = (char *) cmdline;
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+ char *rp = rd;
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char varname[200];
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char *vp = varname;
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char *args;
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@@ -149,10 +150,18 @@ grub_parser_split_cmdline (const char *cmdline,
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*argv = NULL;
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do
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{
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- if (!rd || !*rd)
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+ if (rp == NULL || *rp == '\0')
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{
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+ if (rd != cmdline)
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+ {
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+ grub_free (rd);
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+ rd = rp = NULL;
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+ }
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if (getline)
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- getline (&rd, 1, getline_data);
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+ {
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+ getline (&rd, 1, getline_data);
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+ rp = rd;
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+ }
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else
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break;
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}
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@@ -160,12 +169,12 @@ grub_parser_split_cmdline (const char *cmdline,
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if (!rd)
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break;
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- for (; *rd; rd++)
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+ for (; *rp != '\0'; rp++)
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{
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grub_parser_state_t newstate;
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char use;
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- newstate = grub_parser_cmdline_state (state, *rd, &use;;
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+ newstate = grub_parser_cmdline_state (state, *rp, &use;;
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/* If a variable was being processed and this character does
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not describe the variable anymore, write the variable to
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@@ -198,6 +207,9 @@ grub_parser_split_cmdline (const char *cmdline,
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}
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while (state != GRUB_PARSER_STATE_TEXT && !check_varstate (state));
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+ if (rd != cmdline)
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+ grub_free (rd);
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+
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/* A special case for when the last character was part of a
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variable. */
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add_var (varname, &bp, &vp, state, GRUB_PARSER_STATE_TEXT);
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