[PATCH 11/99] fbdev/aty: Duplicate video-mode option string

[Thomas Zimmermann]

Assume that the driver does not own the option string or its substrings
and hence duplicate the option string for the video mode. The driver only
parses the option string once as part of module initialization, so use
a static buffer to store the duplicated mode option. Linux automatically
frees the memory upon releasing the module.

Done in preparation of switching the driver to struct option_iter and
constifying the option string.

Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
 drivers/video/fbdev/aty/aty128fb.c    | 12 +++++++++++-
 drivers/video/fbdev/aty/atyfb_base.c  | 13 +++++++++++--
 drivers/video/fbdev/aty/radeon_base.c | 13 +++++++++++--
 3 files changed, 33 insertions(+), 5 deletions(-)

diff --git a/drivers/video/fbdev/aty/aty128fb.c b/drivers/video/fbdev/aty/aty128fb.c
index 36a9ac05a340..3c08904a107f 100644
--- a/drivers/video/fbdev/aty/aty128fb.c
+++ b/drivers/video/fbdev/aty/aty128fb.c
@@ -1723,7 +1723,17 @@ static int aty128fb_setup(char *options)
 			continue;
 		}
 #endif /* CONFIG_PPC_PMAC */
-		mode_option = this_opt;
+		{
+			static char mode_option_buf[256];
+			int ret;
+
+			ret = snprintf(mode_option_buf, sizeof(mode_option_buf), "%s", this_opt);
+			if (WARN(ret < 0, "aty128: ignoring invalid option, ret=%d\n", ret))
+				continue;
+			if (WARN(ret >= sizeof(mode_option_buf), "aty128fb: option too long\n"))
+				continue;
+			mode_option = mode_option_buf;
+		}
 	}
 	return 0;
 }
diff --git a/drivers/video/fbdev/aty/atyfb_base.c b/drivers/video/fbdev/aty/atyfb_base.c
index b02e4e645035..5e6e83472c30 100644
--- a/drivers/video/fbdev/aty/atyfb_base.c
+++ b/drivers/video/fbdev/aty/atyfb_base.c
@@ -3896,8 +3896,17 @@ static int __init atyfb_setup(char *options)
 			}
 		}
 #endif
-		else
-			mode = this_opt;
+		else {
+			static char mode_option_buf[256];
+			int ret;
+
+			ret = snprintf(mode_option_buf, sizeof(mode_option_buf), "%s", this_opt);
+			if (WARN(ret < 0, "atyfb: ignoring invalid option, ret=%d\n", ret))
+				continue;
+			if (WARN(ret >= sizeof(mode_option_buf), "atyfb: option too long\n"))
+				continue;
+			mode = mode_option_buf;
+		}
 	}
 	return 0;
 }
diff --git a/drivers/video/fbdev/aty/radeon_base.c b/drivers/video/fbdev/aty/radeon_base.c
index 657064227de8..b885a7cc2424 100644
--- a/drivers/video/fbdev/aty/radeon_base.c
+++ b/drivers/video/fbdev/aty/radeon_base.c
@@ -2596,8 +2596,17 @@ static int __init radeonfb_setup (char *options)
 		} else if (!strncmp(this_opt, "ignore_devlist", 14)) {
 			ignore_devlist = 1;
 #endif
-		} else
-			mode_option = this_opt;
+		} else {
+			static char mode_option_buf[256];
+			int ret;
+
+			ret = snprintf(mode_option_buf, sizeof(mode_option_buf), "%s", this_opt);
+			if (WARN(ret < 0, "radeonfb: ignoring invalid option, ret=%d\n", ret))
+				continue;
+			if (WARN(ret >= sizeof(mode_option_buf), "radeonfb: option too long\n"))
+				continue;
+			mode_option = mode_option_buf;
+		}
 	}
 	return 0;
 }
-- 
2.39.2