[PATCH 4.14 111/173] mtdchar: fix overflows in adjustment of `count`

4.14-stable review patch. If anyone has any objections, please let me know. -- From: Jann Horn [ Upstream commit 6c6bc9ea84d0008024606bf5ba10519e20d851bf ] The first checks in mtdchar_read() and mtdchar_write() attempt to limit `count` such that `*ppos + count <= mtd->size`.

[PATCH 4.14 111/173] mtdchar: fix overflows in adjustment of `count`

4.14-stable review patch. If anyone has any objections, please let me know. -- From: Jann Horn [ Upstream commit 6c6bc9ea84d0008024606bf5ba10519e20d851bf ] The first checks in mtdchar_read() and mtdchar_write() attempt to limit `count` such that `*ppos + count <= mtd->size`.