[PATCH v3] erofs: fix error handling in z_erofs_init_decompressor

[Sandeep Dhavale <dhavale@google.com>]

If we get a failure at the first decompressor init (i = 0),
the clean up while loop could enter infinite loop due to wrong while
check. Check the value of i now to see if we need any clean up at all.

Fixes: 5a7cce827ee9 ("erofs: refine z_erofs_{init,exit}_subsystem()")
Reported-by: liujinbao1 <liujinbao1@xiaomi.com>
Signed-off-by: Sandeep Dhavale <dhavale@google.com>
---
v2: https://lore.kernel.org/linux-erofs/20240829122342.309611-1-jinbaoliu365@gmail.com/
v1: https://lore.kernel.org/linux-erofs/20240822062749.4012080-1-jinbaoliu365@gmail.com/

 fs/erofs/decompressor.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/erofs/decompressor.c b/fs/erofs/decompressor.c
index c2253b6a5416..eb318c7ddd80 100644
--- a/fs/erofs/decompressor.c
+++ b/fs/erofs/decompressor.c
@@ -539,7 +539,7 @@ int __init z_erofs_init_decompressor(void)
 	for (i = 0; i < Z_EROFS_COMPRESSION_MAX; ++i) {
 		err = z_erofs_decomp[i] ? z_erofs_decomp[i]->init() : 0;
 		if (err) {
-			while (--i)
+			while (i--)
 				if (z_erofs_decomp[i])
 					z_erofs_decomp[i]->exit();
 			return err;
-- 
2.46.0.469.g59c65b2a67-goog