From e6e1ace9904b72478f0c5a5aa7bd174cb6f62561 Mon Sep 17 00:00:00 2001 From: "H. Peter Anvin" Date: Thu, 25 Oct 2007 16:09:38 -0700 Subject: [PATCH] x86 setup: sizeof() is unsigned, unbreak comparisons We use signed values for limit checking since the values can go negative under certain circumstances. However, sizeof() is unsigned and forces the comparison to be unsigned, so move the comparison into the heap_free() macros so we can ensure it is a signed comparison. Signed-off-by: H. Peter Anvin --- arch/x86/boot/boot.h | 4 ++-- arch/x86/boot/video-bios.c | 2 +- arch/x86/boot/video-vesa.c | 2 +- arch/x86/boot/video.c | 2 +- 4 files changed, 5 insertions(+), 5 deletions(-) diff --git a/arch/x86/boot/boot.h b/arch/x86/boot/boot.h index 887874f4b49f..d2b5adf46512 100644 --- a/arch/x86/boot/boot.h +++ b/arch/x86/boot/boot.h @@ -216,9 +216,9 @@ static inline char *__get_heap(size_t s, size_t a, size_t n) #define GET_HEAP(type, n) \ ((type *)__get_heap(sizeof(type),__alignof__(type),(n))) -static inline int heap_free(void) +static inline bool heap_free(size_t n) { - return heap_end-HEAP; + return (int)(heap_end-HEAP) >= (int)n; } /* copy.S */ diff --git a/arch/x86/boot/video-bios.c b/arch/x86/boot/video-bios.c index 68e65d95cdfd..ed0672a81870 100644 --- a/arch/x86/boot/video-bios.c +++ b/arch/x86/boot/video-bios.c @@ -79,7 +79,7 @@ static int bios_probe(void) video_bios.modes = GET_HEAP(struct mode_info, 0); for (mode = 0x14; mode <= 0x7f; mode++) { - if (heap_free() < sizeof(struct mode_info)) + if (!heap_free(sizeof(struct mode_info))) break; if (mode_defined(VIDEO_FIRST_BIOS+mode)) diff --git a/arch/x86/boot/video-vesa.c b/arch/x86/boot/video-vesa.c index 192190710710..4716b9a96357 100644 --- a/arch/x86/boot/video-vesa.c +++ b/arch/x86/boot/video-vesa.c @@ -57,7 +57,7 @@ static int vesa_probe(void) while ((mode = rdfs16(mode_ptr)) != 0xffff) { mode_ptr += 2; - if (heap_free() < sizeof(struct mode_info)) + if (!heap_free(sizeof(struct mode_info))) break; /* Heap full, can't save mode info */ if (mode & ~0x1ff) diff --git a/arch/x86/boot/video.c b/arch/x86/boot/video.c index e4ba897bf9a3..ad9712f01739 100644 --- a/arch/x86/boot/video.c +++ b/arch/x86/boot/video.c @@ -371,7 +371,7 @@ static void save_screen(void) saved.curx = boot_params.screen_info.orig_x; saved.cury = boot_params.screen_info.orig_y; - if (heap_free() < saved.x*saved.y*sizeof(u16)+512) + if (!heap_free(saved.x*saved.y*sizeof(u16)+512)) return; /* Not enough heap to save the screen */ saved.data = GET_HEAP(u16, saved.x*saved.y); -- GitLab