4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Mirsad Todorovac mtodorovac69@gmail.com
[ Upstream commit 336c218dd7f0588ed8a7345f367975a00a4f003f ]
GCC 12.3.0 compiler on linux-next next-20240709 tree found the execution path in which, due to lazy evaluation, devlength isn't initialised with the parsed string:
289 while (map) { 290 devname = devstart = devlength = NULL; 291 292 if (!(devname = strsep(&map, ","))) { 293 E("slram: No devicename specified.\n"); 294 break; 295 } 296 T("slram: devname = %s\n", devname); 297 if ((!map) || (!(devstart = strsep(&map, ",")))) { 298 E("slram: No devicestart specified.\n"); 299 } 300 T("slram: devstart = %s\n", devstart); → 301 if ((!map) || (!(devlength = strsep(&map, ",")))) { 302 E("slram: No devicelength / -end specified.\n"); 303 } → 304 T("slram: devlength = %s\n", devlength); 305 if (parse_cmdline(devname, devstart, devlength) != 0) { 306 return(-EINVAL); 307 }
Parsing should be finished after map == NULL, so a break is best inserted after each E("slram: ... \n") error message.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: Miquel Raynal miquel.raynal@bootlin.com Cc: Richard Weinberger richard@nod.at Cc: Vignesh Raghavendra vigneshr@ti.com Cc: linux-mtd@lists.infradead.org Signed-off-by: Mirsad Todorovac mtodorovac69@gmail.com Signed-off-by: Miquel Raynal miquel.raynal@bootlin.com Link: https://lore.kernel.org/linux-mtd/20240711234319.637824-1-mtodorovac69@gmail... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/mtd/devices/slram.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/mtd/devices/slram.c b/drivers/mtd/devices/slram.c index 10183ee4e12b2..aa4f73aef3626 100644 --- a/drivers/mtd/devices/slram.c +++ b/drivers/mtd/devices/slram.c @@ -295,10 +295,12 @@ static int __init init_slram(void) T("slram: devname = %s\n", devname); if ((!map) || (!(devstart = strsep(&map, ",")))) { E("slram: No devicestart specified.\n"); + break; } T("slram: devstart = %s\n", devstart); if ((!map) || (!(devlength = strsep(&map, ",")))) { E("slram: No devicelength / -end specified.\n"); + break; } T("slram: devlength = %s\n", devlength); if (parse_cmdline(devname, devstart, devlength) != 0) {