| From | Ben Hutchings <> | Date | Sat, 22 Sep 2018 01:15:42 +0100 | Subject | [PATCH 3.16 19/63] jfs: Fix inconsistency between memory allocation and ea_buf->max_size |
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3.16.58-rc1 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> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- fs/jfs/xattr.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
--- a/fs/jfs/xattr.c +++ b/fs/jfs/xattr.c @@ -493,15 +493,17 @@ 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;
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