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authorSteve French <sfrench@us.ibm.com>2009-03-18 05:57:22 +0000
committerSteve French <sfrench@us.ibm.com>2009-03-18 05:57:22 +0000
commitb363b3304bcf68c4541683b2eff70b29f0446a5b (patch)
treeda2a563b452cc14f900394f3ad56aa47701c5ea5
parentc6c00919ab16717f228aac20ee72dc83c4430537 (diff)
[CIFS] Fix memory overwrite when saving nativeFileSystem field during mount
CIFS can allocate a few bytes to little for the nativeFileSystem field during tree connect response processing during mount. This can result in a "Redzone overwritten" message to be logged. Signed-off-by: Sridhar Vinay <vinaysridhar@in.ibm.com> Acked-by: Shirish Pargaonkar <shirishp@us.ibm.com> CC: Stable <stable@kernel.org> Signed-off-by: Steve French <sfrench@us.ibm.com>
-rw-r--r--fs/cifs/CHANGES3
-rw-r--r--fs/cifs/connect.c2
2 files changed, 4 insertions, 1 deletions
diff --git a/fs/cifs/CHANGES b/fs/cifs/CHANGES
index fc977dfe9593..65984006192c 100644
--- a/fs/cifs/CHANGES
+++ b/fs/cifs/CHANGES
@@ -13,6 +13,9 @@ parameter to allow user to disable sending the (slow) SMB flush on
fsync if desired (fsync still flushes all cached write data to the server).
Posix file open support added (turned off after one attempt if server
fails to support it properly, as with Samba server versions prior to 3.3.2)
+Fix "redzone overwritten" bug in cifs_put_tcon (CIFSTcon may allocate too
+little memory for the "nativeFileSystem" field returned by the server
+during mount).
Version 1.56
------------
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index cd4ccc8ce471..0de3b5615a22 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -3674,7 +3674,7 @@ CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
BCC(smb_buffer_response)) {
kfree(tcon->nativeFileSystem);
tcon->nativeFileSystem =
- kzalloc(length + 2, GFP_KERNEL);
+ kzalloc(2*(length + 1), GFP_KERNEL);
if (tcon->nativeFileSystem)
cifs_strfromUCS_le(
tcon->nativeFileSystem,