[PATCH 2/2] dlmalloc: populate errno on error

[Ahmad Fatoum]

TLSF already populates errno on errors, so do likewise for the
allocators that don't.

Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
---
 common/dlmalloc.c | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/common/dlmalloc.c b/common/dlmalloc.c
index c634fb1997a5..c41487d54b4a 100644
--- a/common/dlmalloc.c
+++ b/common/dlmalloc.c
@@ -1,5 +1,6 @@
 
 #include <config.h>
+#include <errno.h>
 #include <malloc.h>
 #include <string.h>
 #include <memory.h>
@@ -1167,8 +1168,10 @@ void *malloc(size_t bytes)
 
 	INTERNAL_SIZE_T nb;
 
-	if ((long) bytes < 0)
+	if ((long) bytes < 0) {
+		errno = ENOMEM;
 		return NULL;
+	}
 
 	nb = request2size(bytes); /* padded request size; */
 
@@ -1322,8 +1325,10 @@ void *malloc(size_t bytes)
 	if ((remainder_size = chunksize (top) - nb) < (long) MINSIZE) {
 		/* Try to extend */
 		malloc_extend_top(nb);
-		if ((remainder_size = chunksize(top) - nb) < (long) MINSIZE)
+		if ((remainder_size = chunksize(top) - nb) < (long) MINSIZE) {
+			errno = ENOMEM;
 			return NULL;	/* propagate failure */
+		}
 	}
 
 	victim = top;
@@ -1487,8 +1492,10 @@ void *realloc(void *oldmem, size_t bytes)
 	}
 #endif
 
-	if ((long)bytes < 0)
+	if ((long)bytes < 0) {
+		errno = ENOMEM;
 		return NULL;
+	}
 
 	/* realloc of null is supposed to be same as malloc */
 	if (!oldmem)
@@ -1654,8 +1661,10 @@ void *memalign(size_t alignment, size_t bytes)
 	mchunkptr remainder;	/* spare room at end to split off */
 	long remainder_size;	/* its size */
 
-	if ((long) bytes < 0)
+	if ((long) bytes < 0) {
+		errno = ENOMEM;
 		return NULL;
+	}
 
 	/* If need less alignment than we give anyway, just relay to malloc */
 
@@ -1737,8 +1746,10 @@ void *calloc(size_t n, size_t elem_size)
 	mchunkptr oldtop = top;
 	INTERNAL_SIZE_T oldtopsize = chunksize(top);
 
-	if ((long)n < 0)
+	if ((long)n < 0) {
+		errno = ENOMEM;
 		return NULL;
+	}
 
 	mem = malloc(sz);
 
-- 
2.39.2