linux-ext4 - [PATCH 2/3] libss: fix possible NULL pointer dereferece on allocation failure

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Date:   Thu, 17 Feb 2022 10:24:59 +0100
From:   Lukas Czerner <lczerner@...hat.com>
To:     tytso@....edu
Cc:     linux-ext4@...r.kernel.org
Subject: [PATCH 2/3] libss: fix possible NULL pointer dereferece on allocation failure

Currently in ss_execute_command() we're missng a check to see if the
memory allocation was succesful. Fix it by adding SS_ET_ENOMEM error and
checking the return from malloc.

Signed-off-by: Lukas Czerner <lczerner@...hat.com>
---
 lib/ss/execute_cmd.c | 2 ++
 lib/ss/ss_err.et     | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/lib/ss/execute_cmd.c b/lib/ss/execute_cmd.c
index d443a468..0bcaa54d 100644
--- a/lib/ss/execute_cmd.c
+++ b/lib/ss/execute_cmd.c
@@ -171,6 +171,8 @@ int ss_execute_command(int sci_idx, register char *argv[])
 	for (argp = argv; *argp; argp++)
 		argc++;
 	argp = (char **)malloc((argc+1)*sizeof(char *));
+	if (!argp)
+		return(SS_ET_ENOMEM);
 	for (i = 0; i <= argc; i++)
 		argp[i] = argv[i];
 	i = really_execute_command(sci_idx, argc, &argp);
diff --git a/lib/ss/ss_err.et b/lib/ss/ss_err.et
index 80e9dfa4..f7238da0 100644
--- a/lib/ss/ss_err.et
+++ b/lib/ss/ss_err.et
@@ -36,4 +36,7 @@ ec	SS_ET_ESCAPE_DISABLED,
 ec	SS_ET_UNIMPLEMENTED,
 	"Sorry, this request is not yet implemented"
 
+ec	SS_ET_ENOMEM,
+	"Not enough memory"
+
 	end
-- 
2.34.1