* [COMMITTED 2.33] wordexp: handle overflow in positional parameter number (bug 28011)
@ 2021-07-06 19:08 Aurelien Jarno
0 siblings, 0 replies; only message in thread
From: Aurelien Jarno @ 2021-07-06 19:08 UTC (permalink / raw)
To: libc-stable; +Cc: Andreas Schwab
From: Andreas Schwab <schwab@linux-m68k.org>
Use strtoul instead of atoi so that overflow can be detected.
(cherry picked from commit 5adda61f62b77384718b4c0d8336ade8f2b4b35c)
---
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. */
--
2.30.2
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2021-07-06 19:08 [COMMITTED 2.33] wordexp: handle overflow in positional parameter number (bug 28011) Aurelien Jarno
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