[PATCH 1/2] fpga: altera-cvp: Avoid out-of-bounds read in trailing byte write

[Daisuke Matsuda <dskmtsd@gmail.com>]

From: Daisuke Matsuda <matsuda@preferred.jp>

The trailing byte path in altera_cvp_send_block() dereferences a u32
pointer even when only 1-3 bytes remain in the input buffer. If the buffer
ends at a page or scatterlist boundary, this can read past the valid image
data and fault.

Copy the remaining bytes into a zero-initialized u32 before writing the
final word so only valid bytes are read from the input buffer.

Fixes: 34d1dc17ce97 ("fpga manager: Add Altera CvP driver")
Signed-off-by: Daisuke Matsuda <matsuda@preferred.jp>
---
 drivers/fpga/altera-cvp.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/fpga/altera-cvp.c b/drivers/fpga/altera-cvp.c
index 44badfd11e1b..c00292370a8e 100644
--- a/drivers/fpga/altera-cvp.c
+++ b/drivers/fpga/altera-cvp.c
@@ -16,6 +16,7 @@
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/sizes.h>
+#include <linux/string.h>
 
 #define CVP_BAR		0	/* BAR used for data transfer in memory mode */
 #define CVP_DUMMY_WR	244	/* dummy writes to clear CvP state machine */
@@ -261,7 +262,7 @@ static int altera_cvp_v2_wait_for_credit(struct fpga_manager *mgr,
 static int altera_cvp_send_block(struct altera_cvp_conf *conf,
 				 const u32 *data, size_t len)
 {
-	u32 mask, words = len / sizeof(u32);
+	u32 word, words = len / sizeof(u32);
 	int i, remainder;
 
 	for (i = 0; i < words; i++)
@@ -270,9 +271,9 @@ static int altera_cvp_send_block(struct altera_cvp_conf *conf,
 	/* write up to 3 trailing bytes, if any */
 	remainder = len % sizeof(u32);
 	if (remainder) {
-		mask = BIT(remainder * 8) - 1;
-		if (mask)
-			conf->write_data(conf, *data & mask);
+		word = 0;
+		memcpy(&word, data, remainder);
+		conf->write_data(conf, word);
 	}
 
 	return 0;
-- 
2.47.3