60 lines
1.9 KiB
Diff
60 lines
1.9 KiB
Diff
diff --git a/bins/unzip-mem.c b/bins/unzip-mem.c
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index c45cb72..ff564a5 100644
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--- a/bins/unzip-mem.c
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+++ b/bins/unzip-mem.c
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@@ -88,10 +88,53 @@ static void zzip_mem_entry_pipe(ZZIP_MEM_DISK* disk,
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}
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}
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+
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+
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+
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+static inline void
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+remove_dotdotslash(char *path)
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+{
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+ /* Note: removing "../" from the path ALWAYS shortens the path, never adds to it! */
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+ char *dotdotslash;
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+ int warned = 0;
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+
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+ dotdotslash = path;
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+ while ((dotdotslash = strstr(dotdotslash, "../")) != NULL)
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+ {
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+ /*
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+ * Remove only if at the beginning of the pathname ("../path/name")
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+ * or when preceded by a slash ("path/../name"),
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+ * otherwise not ("path../name..")!
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+ */
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+ if (dotdotslash == path || dotdotslash[-1] == '/')
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+ {
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+ char *src, *dst;
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+ if (!warned)
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+ {
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+ /* Note: the first time through the pathname is still intact */
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+ fprintf(stderr, "Removing \"../\" path component(s) in %s\n", path);
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+ warned = 1;
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+ }
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+ /* We cannot use strcpy(), as there "The strings may not overlap" */
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+ for (src = dotdotslash+3, dst=dotdotslash; (*dst = *src) != '\0'; src++, dst++)
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+ ;
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+ }
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+ else
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+ dotdotslash +=3; /* skip this instance to prevent infinite loop */
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+ }
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+}
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+
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static void zzip_mem_entry_make(ZZIP_MEM_DISK* disk,
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ZZIP_MEM_ENTRY* entry)
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{
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- FILE* file = fopen (entry->zz_name, "w");
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+ char name_stripped[PATH_MAX+1];
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+ FILE* file;
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+
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+ strncpy(name_stripped, entry->zz_name, PATH_MAX);
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+ name_stripped[PATH_MAX]='\0';
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+ remove_dotdotslash(name_stripped);
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+
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+ file = fopen (name_stripped, "wb");
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if (file) { zzip_mem_entry_pipe (disk, entry, file); fclose (file); }
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perror (entry->zz_name);
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if (status < EXIT_WARNINGS) status = EXIT_WARNINGS;
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