Patch "powerpc/boot: Only free if realloc() succeeds" has been added to the 4.19-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    powerpc/boot: Only free if realloc() succeeds

to the 4.19-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     powerpc-boot-only-free-if-realloc-succeeds.patch
and it can be found in the queue-4.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit f7e392f464dc1026793bc9358b9e1d7017d2bdeb
Author: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Date:   Thu Feb 29 22:51:49 2024 +1100

    powerpc/boot: Only free if realloc() succeeds
    
    [ Upstream commit f2d5bccaca3e8c09c9b9c8485375f7bdbb2631d2 ]
    
    simple_realloc() frees the original buffer (ptr) even if the
    reallocation failed.
    
    Fix it to behave like standard realloc() and only free the original
    buffer if the reallocation succeeded.
    
    Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
    Link: https://msgid.link/20240229115149.749264-1-mpe@xxxxxxxxxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/arch/powerpc/boot/simple_alloc.c b/arch/powerpc/boot/simple_alloc.c
index 188c4f996512a..bc99f75b8582d 100644
--- a/arch/powerpc/boot/simple_alloc.c
+++ b/arch/powerpc/boot/simple_alloc.c
@@ -114,10 +114,11 @@ static void *simple_realloc(void *ptr, unsigned long size)
 		return ptr;
 
 	new = simple_malloc(size);
-	if (new)
+	if (new) {
 		memcpy(new, ptr, p->size);
+		simple_free(ptr);
+	}
 
-	simple_free(ptr);
 	return new;
 }