Geert Uytterhoeven a1d6a60ee0 auxdisplay: img-ascii-lcd: Fix lock-up when displaying empty string ... [ Upstream commit afcb5a811f ] While writing an empty string to a device attribute is a no-op, and thus does not need explicit safeguards, the user can still write a single newline to an attribute file: echo > .../message If that happens, img_ascii_lcd_display() trims the newline, yielding an empty string, and causing an infinite loop in img_ascii_lcd_scroll(). Fix this by adding a check for empty strings. Clear the display in case one is encountered. Fixes: 0cad855fbd ("auxdisplay: img-ascii-lcd: driver for simple ASCII LCD displays") Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-11-18 14:04:24 +01:00
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arm-charlcd.c	auxdisplay: Replace HTTP links with HTTPS ones	2020-08-08 16:10:03 +02:00
cfag12864b.c	treewide: kmalloc() -> kmalloc_array()	2018-06-12 16:19:22 -07:00
cfag12864bfb.c	auxdisplay: constify fb ops	2019-12-11 12:31:39 +02:00
charlcd.c	auxdisplay: charlcd: Reuse hex_to_bin() instead of custom code	2020-05-29 23:33:50 +02:00
charlcd.h	auxdisplay: charlcd: add include guard to charlcd.h	2019-08-08 19:59:50 +02:00
hd44780.c	auxdisplay: charlcd: move charlcd.h to drivers/auxdisplay	2019-08-08 19:59:17 +02:00
ht16k33.c	auxdisplay: ht16k33: Fix refresh rate handling	2021-03-04 11:38:00 +01:00
img-ascii-lcd.c	auxdisplay: img-ascii-lcd: Fix lock-up when displaying empty string	2021-11-18 14:04:24 +01:00
Kconfig	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
ks0108.c	auxdisplay: Replace licenses with SPDX identifiers	2018-04-12 19:02:45 +02:00
Makefile	auxdisplay: deconfuse configuration	2019-03-17 08:48:33 +01:00
panel.c	treewide: Use fallthrough pseudo-keyword	2020-08-23 17:36:59 -05:00