libpayload: Add wrappers for malloc which check its return value.

The xmalloc wrapper checks whether the malloc succeeded, and if not stops
execution and prints a message. xmalloc always returns a valid pointer. The
xzalloc wrapper does the same thing, but also zeroes the memory before
returning it.

Old-Change-Id: I00e7de04a5c368ab3603530b98bd3e3596e10632
Signed-off-by: Gabe Black <>
Reviewed-by: Julius Werner <>
Reviewed-by: David Hendricks <>
Commit-Queue: Gabe Black <>
Tested-by: Gabe Black <>
(cherry picked from commit 4029796d4f66601e33ae3038dbfc3299f56baf89)

libpayload: malloc: Fix xmalloc() for zero byte allocations

The C standard considers it legal to return a NULL pointer for zero
length memory allocations, and our malloc implementation does in fact
make use of that. xmalloc() and xzmalloc() should therefore not consider
this case a failure.

Also fixed a minor formatting issue.

Old-Change-Id: Ib9b75df9458ce2ba75fd0bc0af9814a3323298eb
Signed-off-by: Julius Werner <>
Reviewed-by: Mike Frysinger <>
Reviewed-by: David Hendricks <>
(cherry picked from commit 3033437e9d89c6072464860ea50ea27dcb76fe54)

Squashed 2 libpayload malloc related commits.

Change-Id: I682ef5f4aad58c93ae2be40e2edc1fd29e5d0438
Signed-off-by: Isaac Christensen <>
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <>
1 file changed