4.19-stable patches

added patches:
	unifdef-use-memcpy-instead-of-strncpy.patch

diff --git a/queue-4.19/series b/queue-4.19/series
index 0738ea788d790ca9b87b4b551f6c622c629135cf..0a0e2dca9f305206dc076e003c2233d728bac5a7 100644 (file)
--- a/queue-4.19/series
+++ b/queue-4.19/series
@@ -1,2 +1,3 @@
 blk-mq-fix-corruption-with-direct-issue.patch
 test_hexdump-use-memcpy-instead-of-strncpy.patch
+unifdef-use-memcpy-instead-of-strncpy.patch

diff --git a/queue-4.19/unifdef-use-memcpy-instead-of-strncpy.patch b/queue-4.19/unifdef-use-memcpy-instead-of-strncpy.patch
new file mode 100644 (file)
index 0000000..a0ff78a
--- /dev/null
+++ b/queue-4.19/unifdef-use-memcpy-instead-of-strncpy.patch
@@ -0,0 +1,46 @@
+From 38c7b224ce22c25fed04007839edf974bd13439d Mon Sep 17 00:00:00 2001
+From: Linus Torvalds <torvalds@linux-foundation.org>
+Date: Fri, 30 Nov 2018 14:45:01 -0800
+Subject: unifdef: use memcpy instead of strncpy
+
+From: Linus Torvalds <torvalds@linux-foundation.org>
+
+commit 38c7b224ce22c25fed04007839edf974bd13439d upstream.
+
+New versions of gcc reasonably warn about the odd pattern of
+
+       strncpy(p, q, strlen(q));
+
+which really doesn't make sense: the strncpy() ends up being just a slow
+and odd way to write memcpy() in this case.
+
+There was a comment about _why_ the code used strncpy - to avoid the
+terminating NUL byte, but memcpy does the same and avoids the warning.
+
+Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+---
+ scripts/unifdef.c |    4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+--- a/scripts/unifdef.c
++++ b/scripts/unifdef.c
+@@ -395,7 +395,7 @@ usage(void)
+  * When we have processed a group that starts off with a known-false
+  * #if/#elif sequence (which has therefore been deleted) followed by a
+  * #elif that we don't understand and therefore must keep, we edit the
+- * latter into a #if to keep the nesting correct. We use strncpy() to
++ * latter into a #if to keep the nesting correct. We use memcpy() to
+  * overwrite the 4 byte token "elif" with "if  " without a '\0' byte.
+  *
+  * When we find a true #elif in a group, the following block will
+@@ -450,7 +450,7 @@ static void Idrop (void) { Fdrop();  ign
+ static void Itrue (void) { Ftrue();  ignoreon(); }
+ static void Ifalse(void) { Ffalse(); ignoreon(); }
+ /* modify this line */
+-static void Mpass (void) { strncpy(keyword, "if  ", 4); Pelif(); }
++static void Mpass (void) { memcpy(keyword, "if  ", 4); Pelif(); }
+ static void Mtrue (void) { keywordedit("else");  state(IS_TRUE_MIDDLE); }
+ static void Melif (void) { keywordedit("endif"); state(IS_FALSE_TRAILER); }
+ static void Melse (void) { keywordedit("endif"); state(IS_FALSE_ELSE); }