Commit b763ec17 authored by Mark Brown's avatar Mark Brown
Browse files

regmap: debugfs: Ensure we don't underflow when printing access masks



If a read is attempted which is smaller than the line length then we may
underflow the subtraction we're doing with the unsigned size_t type so
move some of the calculation to be additions on the right hand side
instead in order to avoid this.

Reported-by: default avatarRasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Mark Brown's avatarMark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
parent 6ff33f39
......@@ -432,7 +432,7 @@ static ssize_t regmap_access_read_file(struct file *file,
/* If we're in the region the user is trying to read */
if (p >= *ppos) {
/* ...but not beyond it */
if (buf_pos >= count - 1 - tot_len)
if (buf_pos + tot_len + 1 >= count)
break;
/* Format the register */
......
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