Changeset 14741a0 in mainline for kernel/generic/src/ddi/ddi.c

Timestamp:

2017-11-15T00:15:46Z (6 years ago)

Author:

Aearsis <Hlavaty.Ondrej@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

517c67ab

Parents:

6ba2db4b

Message:

ddi: do not assume arguments are correct

When an uspace app requests to map 0 bytes, dmamem_map_anonymous calls
frame_alloc, which asserts the size is not zero, causing kernel panic.

File:

• kernel/generic/src/ddi/ddi.c (modified) (1 diff)

kernel/generic/src/ddi/ddi.c

@@ -382 +382 @@
         
         size_t frames = SIZE2FRAMES(size);
+        if (frames == 0)
+                return EINVAL;
+
         *phys = frame_alloc(frames, FRAME_ATOMIC, constraint);
         if (*phys == 0)