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-rw-r--r--shell/hush.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/shell/hush.c b/shell/hush.c
index 2c4704a..9c0cd7c 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -471,8 +471,10 @@ struct globals {
smallint fake_mode;
/* these three support $?, $#, and $1 */
smalluint last_return_code;
+ /* is global_argv and global_argv[1..n] malloced? (note: not [0]) */
smalluint global_args_malloced;
- int global_argc; /* NB: $# + 1 */
+ /* how many non-NULL argv's we have. NB: $# + 1 */
+ int global_argc;
char **global_argv;
#if ENABLE_HUSH_LOOPS
unsigned depth_break_continue;
@@ -4728,9 +4730,14 @@ static int builtin_shift(char **argv)
n = atoi(argv[1]);
}
if (n >= 0 && n < G.global_argc) {
- G.global_argv[n] = G.global_argv[0];
+ if (G.global_args_malloced) {
+ int m = 1;
+ while (m <= n)
+ free(G.global_argv[m++]);
+ }
G.global_argc -= n;
- G.global_argv += n;
+ memmove(&G.global_argv[1], &G.global_argv[n+1],
+ G.global_argc * sizeof(G.global_argv[0]));
return EXIT_SUCCESS;
}
return EXIT_FAILURE;