Commit fc961522 authored Jun 08, 2020 by Dan Carpenter Committed by Namjae Jeon Jun 09, 2020

exfat: Fix potential use after free in exfat_load_upcase_table()



This code calls brelse(bh) and then dereferences "bh" on the next line
resulting in a possible use after free.  The brelse() should just be
moved down a line.

Fixes: b676fdbcf4c8 ("exfat: standardize checksum calculation")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>

parent a949824f

fs/exfat/nls.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -692,8 +692,8 @@ static int exfat_load_upcase_table(struct super_block *sb,
		index++;
		}
		}
		brelse(bh);
		chksum = exfat_calc_chksum32(bh->b_data, i, chksum, CS_DEFAULT);
		brelse(bh);
		}

		if (index >= 0xFFFF && utbl_checksum == chksum)

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