From 511f1ae4982e39d8e456df7e01ac2dc5a62acebd Mon Sep 17 00:00:00 2001 From: Jeremy Allison Date: Tue, 31 Mar 2015 14:40:23 -0700 Subject: [PATCH] s3: libsmbclient: After getting attribute server, ensure main srv pointer is still valid. Bug #11186: Crash seen in libsmbclient due to free of server structure during SMBC_getxattr() call https://bugzilla.samba.org/show_bug.cgi?id=11186 Signed-off-by: Jeremy Allison --- source3/libsmb/libsmb_xattr.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/source3/libsmb/libsmb_xattr.c b/source3/libsmb/libsmb_xattr.c index 8493776..9f7bea8 100644 --- a/source3/libsmb/libsmb_xattr.c +++ b/source3/libsmb/libsmb_xattr.c @@ -2073,6 +2073,25 @@ SMBC_getxattr_ctx(SMBCCTX *context, if (! srv->no_nt_session) { ipc_srv = SMBC_attr_server(frame, context, server, port, share, &workgroup, &user, &password); + /* + * SMBC_attr_server() can cause the original + * server to be removed from the cache. + * If so we must error out here as the srv + * pointer has been freed. + */ + if (smbc_getFunctionGetCachedServer(context)(context, + server, + share, + workgroup, + user) != srv) { +#if defined(ECONNRESET) + errno = ECONNRESET; +#else + errno = ETIMEDOUT; +#endif + TALLOC_FREE(frame); + return -1; + } if (! ipc_srv) { srv->no_nt_session = True; } @@ -2208,9 +2227,31 @@ SMBC_removexattr_ctx(SMBCCTX *context, } if (! srv->no_nt_session) { + int saved_errno; ipc_srv = SMBC_attr_server(frame, context, server, port, share, &workgroup, &user, &password); + saved_errno = errno; + /* + * SMBC_attr_server() can cause the original + * server to be removed from the cache. + * If so we must error out here as the srv + * pointer has been freed. + */ + if (smbc_getFunctionGetCachedServer(context)(context, + server, + share, + workgroup, + user) != srv) { +#if defined(ECONNRESET) + errno = ECONNRESET; +#else + errno = ETIMEDOUT; +#endif + TALLOC_FREE(frame); + return -1; + } if (! ipc_srv) { + errno = saved_errno; srv->no_nt_session = True; } } else { -- 2.2.0.rc0.207.ga3a616c