From: Andreas Schwab <schwab@linux-m68k.org>
To: libc-alpha@sourceware.org
Subject: [PATCH] wordexp: handle overflow in positional parameter number (bug 28011)
Date: Fri, 25 Jun 2021 16:33:48 +0200 [thread overview]
Message-ID: <87pmwaypwz.fsf@igel.home> (raw)
Use strtoul instead of atoi so that overflow can be detected.
---
posix/wordexp-test.c | 1 +
posix/wordexp.c | 2 +-
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/posix/wordexp-test.c b/posix/wordexp-test.c
index f93a546d7e..9df02dbbb3 100644
--- a/posix/wordexp-test.c
+++ b/posix/wordexp-test.c
@@ -183,6 +183,7 @@ struct test_case_struct
{ 0, NULL, "$var", 0, 0, { NULL, }, IFS },
{ 0, NULL, "\"\\n\"", 0, 1, { "\\n", }, IFS },
{ 0, NULL, "", 0, 0, { NULL, }, IFS },
+ { 0, NULL, "${1234567890123456789012}", 0, 0, { NULL, }, IFS },
/* Flags not already covered (testit() has special handling for these) */
{ 0, NULL, "one two", WRDE_DOOFFS, 2, { "one", "two", }, IFS },
diff --git a/posix/wordexp.c b/posix/wordexp.c
index bcbe96e48d..1f3b09f721 100644
--- a/posix/wordexp.c
+++ b/posix/wordexp.c
@@ -1399,7 +1399,7 @@ envsubst:
/* Is it a numeric parameter? */
else if (isdigit (env[0]))
{
- int n = atoi (env);
+ unsigned long n = strtoul (env, NULL, 10);
if (n >= __libc_argc)
/* Substitute NULL. */
--
2.32.0
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1
"And now for something completely different."
next reply other threads:[~2021-06-25 21:38 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-25 14:33 Andreas Schwab [this message]
2021-06-27 15:41 ` Florian Weimer
2021-06-27 17:08 ` Andreas Schwab
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