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From: Jakub Jelinek <jakub@redhat.com>
Date: Thu, 10 Jun 2010 11:32:48 +0000
Subject: [PATCH] jartool.c (extract_jar)
Fix up checks for traversal to parent directories, disallow absolute
paths, make the code slightly more efficient.
Author: Dan Rosenberg <dan.j.rosenberg@gmail.com>
--- a/jartool.c 2010/06/10 08:46:10 1.61
+++ b/jartool.c 2010/06/10 11:32:48 1.62
@@ -1731,7 +1731,17 @@
struct stat sbuf;
int depth = 0;
- tmp_buff = malloc(sizeof(char) * strlen((const char *)filename));
+ if(*filename == '/'){
+ fprintf(stderr, "Absolute path names are not allowed.\n");
+ exit(EXIT_FAILURE);
+ }
+
+ tmp_buff = malloc(strlen((const char *)filename));
+
+ if(tmp_buff == NULL) {
+ fprintf(stderr, "Out of memory.\n");
+ exit(EXIT_FAILURE);
+ }
for(;;){
const ub1 *idx = (const unsigned char *)strchr((const char *)start, '/');
@@ -1766,6 +1779,7 @@
#ifdef DEBUG
printf("Directory exists\n");
#endif
+ tmp_buff[idx - filename] = '/';
continue;
}else {
fprintf(stderr, "Hmmm.. %s exists but isn't a directory!\n",
@@ -1782,10 +1796,11 @@
if(verbose && handle)
printf("%10s: %s/\n", "created", tmp_buff);
+ tmp_buff[idx - filename] = '/';
}
/* only a directory */
- if(strlen((const char *)start) == 0)
+ if(*start == '\0')
dir = TRUE;
#ifdef DEBUG
@@ -1793,7 +1808,7 @@
#endif
/* If the entry was just a directory, don't write to file, etc */
- if(strlen((const char *)start) == 0)
+ if(*start == '\0')
f_fd = -1;
free(tmp_buff);
@@ -1877,7 +1892,8 @@
exit(EXIT_FAILURE);
}
- close(f_fd);
+ if (f_fd != -1)
+ close(f_fd);
if(verbose && dir == FALSE && handle)
printf("%10s: %s\n",
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