4.17-stable review patch. If anyone has any objections, please let me know.
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From: Shankara Pailoor shankarapailoor@gmail.com
commit 92d34134193e5b129dc24f8d79cb9196626e8d7a upstream.
The code is assuming the buffer is max_size length, but we weren't allocating enough space for it.
Signed-off-by: Shankara Pailoor shankarapailoor@gmail.com Signed-off-by: Dave Kleikamp dave.kleikamp@oracle.com Cc: Guenter Roeck linux@roeck-us.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/jfs/xattr.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
--- a/fs/jfs/xattr.c +++ b/fs/jfs/xattr.c @@ -491,15 +491,17 @@ static int ea_get(struct inode *inode, s if (size > PSIZE) { /* * To keep the rest of the code simple. Allocate a - * contiguous buffer to work with + * contiguous buffer to work with. Make the buffer large + * enough to make use of the whole extent. */ - ea_buf->xattr = kmalloc(size, GFP_KERNEL); + ea_buf->max_size = (size + sb->s_blocksize - 1) & + ~(sb->s_blocksize - 1); + + ea_buf->xattr = kmalloc(ea_buf->max_size, GFP_KERNEL); if (ea_buf->xattr == NULL) return -ENOMEM;
ea_buf->flag = EA_MALLOC; - ea_buf->max_size = (size + sb->s_blocksize - 1) & - ~(sb->s_blocksize - 1);
if (ea_size == 0) return 0;