From 457d79f2cb83f3f5c3f8d64ed99f9b1ea0185d3f Mon Sep 17 00:00:00 2001 From: Jeremy Allison Date: Sat, 7 Jun 2014 21:51:44 -0700 Subject: s3: smbd - fix processing of packets with invalid DOS charset conversions. CVE-2014-3493 Bug 10654 - Segmentation fault in smbd_marshall_dir_entry()'s SMB_FIND_FILE_UNIX handler https://bugzilla.samba.org/show_bug.cgi?id=10654 Signed-off-by: Jeremy Allison Reviewed-by: Volker Lendecke Reviewed-by: Guenther Deschner Autobuild-User(master): Jeremy Allison Autobuild-Date(master): Wed Jun 25 03:47:55 CEST 2014 on sn-devel-104 --- source3/lib/charcnv.c | 26 +++++++++++++++++--------- 1 file changed, 17 insertions(+), 9 deletions(-) (limited to 'source3/lib') diff --git a/source3/lib/charcnv.c b/source3/lib/charcnv.c index 71d2c3aba5..2189812e2a 100644 --- a/source3/lib/charcnv.c +++ b/source3/lib/charcnv.c @@ -46,9 +46,9 @@ void gfree_charcnv(void) **/ size_t push_ascii(void *dest, const char *src, size_t dest_len, int flags) { - size_t src_len = strlen(src); + size_t src_len = 0; char *tmpbuf = NULL; - size_t size; + size_t size = 0; bool ret; /* No longer allow a length of -1. */ @@ -62,24 +62,32 @@ size_t push_ascii(void *dest, const char *src, size_t dest_len, int flags) smb_panic("malloc fail"); } if (!strupper_m(tmpbuf)) { + if ((flags & (STR_TERMINATE|STR_TERMINATE_ASCII)) && + dest && + dest_len > 0) { + *(char *)dest = 0; + } SAFE_FREE(tmpbuf); - return (size_t)-1; + return 0; } src = tmpbuf; } + src_len = strlen(src); if (flags & (STR_TERMINATE | STR_TERMINATE_ASCII)) { src_len++; } ret = convert_string(CH_UNIX, CH_DOS, src, src_len, dest, dest_len, &size); - if (ret == false && - (flags & (STR_TERMINATE | STR_TERMINATE_ASCII)) - && dest_len > 0) { - ((char *)dest)[0] = '\0'; - } SAFE_FREE(tmpbuf); - return ret ? size : (size_t)-1; + if (ret == false) { + if ((flags & (STR_TERMINATE | STR_TERMINATE_ASCII)) && + dest_len > 0) { + ((char *)dest)[0] = '\0'; + } + return 0; + } + return size; } /******************************************************************** -- cgit